I try to think of it this way:
A tithe [10%] was what was required to illustrate gratitude to God for His blessings upon the Jewish people … these blessings were freeing the people from captivity in Egypt, Manna from Heaven, etc … illustrated by Moses, the Law and the Prophets…
As Christians we are compelled to be joyful givers - thankful for the Blessings we have received from our God: thus we have Moses, the Law and the Prophets PLUS God Incarnate in the person of Jesus, the Sacraments - especialy the Eucharist - the True Heavenly Bread, the Church, Salvation, Eternal Life … and much much more …
We have so much more …Paraphrasing St Paul - “to whom much is given, much is expected” … Your gift should be from your heart, joyfully given in Thanksgiving to your Creator for the gift Jesus gave to you on the Cross - one that recognizes that everything you possess is God given …
It always seemed to me that 10% is a starting point … yet many Christians believe that since a specific percentage is not written - that means we can start at 0% and then perhaps progress to what we might have in our pocket that we haven’t already planned to spend at Starbucks on the way home from Church … or what we can give without impacting our lifestyle … like puchasing that new video game … They spend more on Pizza out each week then they give for the ‘family meal’ we experience each Sunday in the Eucharist … more for the IPOD or Movie Night then we feel compelled to share for hearing God’s word at the Liturgy of the Word on Sunday …
How much should you give? Enough such that you feel the gift - if it does not impact your budget - you have not given from your need but only from your surplus … Christ gave His all for you … Jesus gave His very Life for you … in the Garden - Jesus did not ask the Father how little He could gveto accomplish the plan of salvation … He gave Abundantly … for me … and for you …