I have heard it from several different people... a friend who joined the army wrote a letter to our Bible study group - he said, "Dream big. God can do big things through you. You have to have a dream." He recommended we listen to this song:dream BIG
And my other friend, who is off in university, told me, "Don't be afraid to dream big. God can to more than you think."
It's true. Look at Amy Carmichael, who went to India with a desire to spread the gospel and ended up founding a community that rescued children from temples. Look at George Muller, who rented a house to make a home for a few orphans - eventually he had several large buildings, and helped thousands of children. God can take your little dream and grow it beyond what you can imagine. He is "able to do exceedingly abundantly above all that we ask or think." (Ephesians 3)
Here's another song I think of when I think of dreaming big:
So this year, I am dreaming big. I am refusing to be held back by fear; fear of failing, fear of my life not working out, fear of what people will think. I am daring to think that if God wants me to go to the Philippines, He will get me there in His time. I am daring to dream that He can use even me to make someone's life better. I am daring to dream that my passion will be for Him, and when I wander, He will bring me back, and that because of Him, my life has a purpose. And I will dream. I won't give up.
(Note: I do not in general listen to Christian rap. and I do not condone country music, though I must say I enjoy it. However, the Lecrae song was recommended by a friend, and the Eli Young Band song is one I heard many times while I was working in the restaurant. Both are ones that have sort of shaped this "Dream Big" goal of mine. So don't you worry about me degenerating. :P)