Many Christians give faithfully but never see the hundredfold return that the Lord promised because of wrong motives (Mk. 10:29-30). Paul said God loves a cheerful giver - not one who gives grudgingly or out of debt (2 Cor. 9:7).
Jesus gave us the key to purifying our motives in this same teaching. He said, "But when thou doest alms, let not thy left hand know what thy right hand doeth" (Mt. 6:3). Giving in a manner in which you will not receive recognition for your gifts will guarantee that your motives are right and grant you the true joy that comes through selfless giving (Acts 20:24).
Ask the Lord to show you an opportunity today to give a kind word or a helping hand to someone who will not be able to repay you and others will never know about it. This could be a motorist in a traffic jam, a co-worker, a spouse, a child who won't even notice your kind deed, or any number of other people.