If you give gladly, even if you give only a little, it is a big gift. If you give unwillingly, even if you give a big gift, you turn it into a small one.
The more wood you pile on a fire the more heat you get, and thus it is with God - the more you think on Him the more you are fired with love and fervor towards Him. He who loves the Lord is always mindful of Him, and remembrance of God begets prayer.