Deuteronomy 9:5

Not for thy righteousness or for the uprightness of thine heart, for that imaginary personal excellence, dost thou go to possess their land, this factor, if it existed, did not enter into the Lord's calculations; but for the wickedness of these nations the Lord, thy God, doth drive them out from before thee, and that He may perform the word which the Lord sware unto thy fathers, Abraham, Isaac, and Jacob. The wickedness of the Canaanites alone would have been reason enough for the Lord to exterminate them and to give their land to the children of Israel, but His chief reason was founded upon His faithfulness, since He wanted to fulfill the promise given to the patriarchs. It is a fact which should be kept in remembrance at all times, that all blessings and benefits of Jehovah are expressions of His unmerited kindness and mercy, this being true especially of all spiritual gifts.