The root of all virtue and ...

The root of all virtue and grace, of all faith and acceptable worship, is that we know that we have nothing but what we receive, and bow in deepest humility to wait upon God for it.
 Andrew Murray

Quotes from the same author

We must begin to believe that God, in the mystery of prayer, has entrusted us with a force that can move the Heavenly world, and can bring its power down to earth.
 Andrew Murray