There are few things I am sure of: pb & j sandwiches must contain grape jelly, the best times with friends aren't planned, air conditioning is a miracle, and God will provide.
The first few things have some truth to them (albeit my own), but the last is definitely one that I put alot of stock in. I learned this discipline from my father, who is still living it today. When I talk to him, it is often of God's provision. He is a self-made man, working for himself and occasionally employing others to help him. I also learned all I know about fixing things from him as well.
My father taught me a great lesson as a child; Don't worry about where "it" is going to come from, but be faithful in what you are called to do, and God will provide.
Matthew 6:25-34 could be said to be a life verse for my father. Take time to read it, study it, absorb it, and then live it. Sometimes it is the simple man not the eccentric theologian that can capture the truth of God's word for his life and live that out.