There are three conversions necessary: the conversion of the heart, mind, and the purse.
Too often we assume that God has increased our income to increase our standard of living, when his stated purpose is to increase our standard of giving. (Look again at 2 Corinthians 8:14 and 9:11).
The purpose of tithing is to secure not the tithe but the tither, not the gift but the giver, not the possession but the possessor, not your money but you for God.
I don’t give God 10% of my income. He let’s me keep 90% of His!
When we place our contribution in the collection plate, we are not giving to the Lord; we are just taking our hands off that which belongs to Him.