Faith

Luke 17:6 says: "The Lord replied, "If you had faith the size of a mustard seed, you could say to this mulberry tree, 'Be uprooted and planted in the sea,' and it would obey you."
and Matthew 17:20 says: "Because you have little faith," he said. "I assure you that if you have faith the size of a mustard seed, you could say to this mountain, 'Go from here to there,' and it will go. There will be nothing that you can't do."

I especially love Hebrews chapter 11:
"Faith is the reality of what we hope for, the proof of what we don't see. The elders in the past were approved because they showed faith. By faith we understand that the universe has been created by a word  from God so that the visible came into existence from the invisible.
By faith Abel offered a better sacrifice to God than Cain, which showed that he was righteous, since God gave approval to him for his gift. Though he died, he's still speaking through faith.
By faith Enoch was taken up so that he didn't see death, and he wasn't found because God took him up. He was given approval for having pleased God before he was taken up. It's impossible to please God without faith because the one who draws near to God must believe that he exists and that he rewards people who try to find him.
By faith Noah responded with godly fear when he was warned about events he hadn't seen yet. He built an ark to deliver his household. With his faith, he criticized the world and became an heir of the righteousness that comes from faith.
By faith Abraham obeyed when he was called to go out to a place that he was going to receive as an inheritance. He went out without knowing where he was going.
By faith he lived in the land he had been promised as a stranger. He lived in tents along with Isaac and Jacob, who were coheirs of the same promise. He was looking forward to a city that has foundations, whose architect and builder is God.
By faith even Sarah received the ability to have a child, though she herself was barren and past the age for having children, because she believed that the one who promised was faithful. So descendants were born from one man (and he was as good as dead). They were as many as the number of the stars in the sky and as countless as the grains of sand on the seashore. All of these people died in faith without receiving the promises, but they saw the promises from a distance and welcomed them. They confessed that they were strangers and immigrants on earth. People who say this kind of thing make it clear that they are looking for a homeland. If they had been thinking about the country that they had left, they would have had the opportunity to return to it. But at this point in time, they are longing for a better country, that is, a heavenly one. Therefore, God isn't ashamed to be called their God -- he was prepared a city for them.
By faith Abraham offered Isaac when he was tested. The one who received the promises was offering his only son. He had been told concerning him, Your legitimate descendants will come from Isaac. He figured that God could even raise him from the dead. So in a way he did receive him back from the dead.
By faith Isaac also blessed Jacob and Esau concerning their future.
By faith Jacob blessed each of Joseph's sons as he was dying and bowed in worship over the head of his staff.
By faith Joseph recalled the exodus of Israelites at the end of his life, and gave instructions about burying his bones.
By faith Moses was hidden by his parents for three months when he was born, because they saw that the child was beautiful and they weren't afraid of the king's orders.
By faith Moses refused to be called the son of Pharaoh's daughter when he was grown up. He chose to be mistreated with God's people instead of having the temporary pleasures of sin. He thought that the abuses he suffered for Christ were more valuable than the treasures of Egypt, since he was looking forward to the reward.
By faith he left Egypt without being afraid of the king's anger. He kept on going as if he could see what is invisible.
By faith he kept the Passover and the sprinkling of blood, in order that the destroyer could not touch their firstborn children.
By faith they crossed the Red Sea as if they were on dry land, but when the Egyptians tried it, they were drowned.
By faith Jericho's walls fell after the people marched around them for seven days.
By faith Rahab the prostitute wasn't killed with the disobedient because she welcomed the spies in peace.
What more can I say? I wold run out of time if I told you about Gideon, Barak, Samson, Jephthah, David, Samuel, and the prophets. Through faith they conquered kingdoms, brought about justice, realized promises, shut the mouths of lions, put out raging fires, escaped from the edge of the sword, found strength in weakness, were mighty in war, and routed foreign armies. Women received back their dead by resurrection. Others were tortured and refused to be released so they could gain a better resurrection.
But others experienced public shame by being taunted and whipped; they were even put in chains and in prison. They were stoned to death, they were cut in two, and they died by being murdered with swords. They went around wearing the skins of sheep and goats, needy, oppressed, and mistreated. The world didn't deserve them. They wandered around in deserts, mountains, caves, and holes in the ground.
All these people didn't receive what was promised, though they were given approval for their faith. God provided something better for us so they wouldn't be made perfect without us."

"Do you seriously think God can't use you?
Noah was a drunk.
Abraham was too old.
Isaac was a daydreamer.
Jacob was a liar.
Leah was ugly.
Joseph was abused.
Moses had a stuttering problem.
Gideon was afraid.
Samson had long hair and was a womanizer.
Rahab was a prostitute.
Jeremiah and Timothy were too young.
David had an affair and was a murderer.
Elijah was suicidal.
Isaiah preached naked.
Jonah ran from God.
Naomi was a widow.
Job went bankrupt.
Peter denied Christ.
The Disciples fell asleep while praying.
Martha worried about everything.
The Samaritan woman was divorced.
Zaccheus was too small.
Paul was too religious.
Timothy had an ulcer.
Lazarus was dead."

1 Corinthians 1:26-31 says: "Look at your situation when you were called, brothers and sisters! By ordinary human standards not many were wise, not many were powerful, not many were from the upper class. But God chose what the world considers foolish to shame the wise. God chose what the world considers weak to shame the strong. And God chose what the world considers low-class and low-life--what is considered to be nothing--to reduce what is considered to be something to nothing. So no human being can brag in God's presence. It is because of God that you are in Christ Jesus. He became wisdom from God for us. This means that he made us righteous and holy, and he delivered us. This is consistent with what was written: The one who brags should brag in the Lord!"

Okay, first of all, I just want to take a second here to say: I don't understand how people can read this and not just be completely amazed by this information. I mean, seriously. God is astounding. He sent Jesus to die for our sins, to die for OUR mistakes, so that we could be forgiven. I mean, seriously, how could we deserve anything of such worth? That's just incredible.
I would also like to say, FAITH IS ESSENTIAL to having a relationship with God. But faith is so much more than most people make it out to be. God wants us to go out in the world and SHARE our faith with the rest of the world. HE CHOSE US to share our LOVE with one another. To share our EXPERIENCES and our GOODNESS. He uses us daily. Minutely. Secondly. Yes, I just made those words up. But seriously, God is CONSTANTLY working through us, using us for His purpose. Using us for OUR purpose. Isn't that just...awesome?!
And not only that, but God calls us to do extraordinary things. He calls us to change people's lives, and in so doing, spread the goodness of Christ. We are to represent God in such a way that it shouldn't be hard for people to realize that it IS God that is working through us, transforming us in such a magnificent way. And don't even think, for one second, that you are not included in this plan. GOD CHOOSES EVERYONE, ALWAYS. and it is up to US whether or not we accept God as our Savior or not. I mean look at this list above...God chose liars, womanizers, murderers, people who worried to much, and trusted them with His plan.

Through Faith, we can do incredible things through Christ.