For an illustration of the difference between proportionate and progressive taxation, we can look to the Bible. There, tithing is explained as the economic basis of our Judaic-Christian religions. The Lord says you shall contribute one-tenth and He says, ‘If I prosper you 10 times as much you will give 10 times as much.’ That is proportionate — but look what happens today when you start computing Caesar’s share. A man of average income who suddenly prospered ten times as much would find his personal income tax increased 43 times. — Ronald Reagan