Let me share something here that is very close to home, matter of fact it was home. I was homeless for a period of my life when I was young. I hated to beg or ask for money because I was hungry. The times I did beg there were some really nice people who did give. I remember one guy who said to me, are you really hungry? I said yes sir I am. So he gave me five dollars, enough for a serious meal at a fast food joint. I will never forget the people who kindly gave to me so that I could eat. There are so many people out there that look down on homeless people, but these people made an impression on me. This really did show me that there was a God, because I never starved, I always was taken care of.
Since then I have vowed that if I had money in my pocket, food with me, I will give whatever I can if someone asks. I try to always to make sure I say something about God when giving, even if it is a God Bless.
I think this ties into what Jesus said, whatever you did for one His lesser brothers you did for Him. (as stated in an above post) These are exactly some of the things Jesus talked about.