"Love is the greatest thing that God can give us; for Himself is love: and it is the greatest thing we can give to God; for it will also give ourselves, and carry with it all that is ours. The apostle calls it the band of perfection; it is the old, and it is the new, and it is the great commandment, and it is all the commandments; for it is the fulfilling of the Law."

Previous Quote

...we must first scrutinize thoroughly anything appearing in our hearts or any saying suggested to us. Has it come purified from the divine and heavenly fire of the Holy Spirit? Or does it lean toward Jewish superstition? Is its surface piety something which has come down from bloated worldly philosophy? We must examine this most carefully, doing as the apostle bids us: 'Do not believe in every spirit, but make sure to find out if spirits are from God'.

— John Cassian