What's the meaning behind fasting on Mondays and Thursdays?

Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions. The reason of fasting on Mondays and Thursdays is that the deeds of slaves are raised to Allah as the Prophet (Sallallahu Alaihi wa Sallam) said: The gates of Paradise are opened on Monday and Thursday. Every Muslim slave who does not associate anything with Allah is forgiven except for the man who has enmity between him and his brother. It is said, 'Leave these two until they have made a reconciliation. Leave these two until they have made a reconciliation.' Allah knows best.