Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you alway, even unto the end of the world. Amen.
Ver. 20. To observe all things] Our obedience must be entire; as for subject, the whole man; so for object, the whole law, that perfect law of liberty. The gospel requireth, that in our judgments we approve, and in our practices prove, what that good and holy and acceptable will of God is. Those are good Catholics, saith Austin, qui et fidem integram sequuntur, et bones mores. But let carnal gospellers either add practice, or leave their profession; renounce the devil and all his works, or else renounce their baptism. As Alexander the Great bade one Alexander, a coward in his army, change his name, or be a soldier.
I am with you alway] viz. To preserve you from your enemies, prosper you in your enterprises, and to do for you whatsoever heart can wish or need require. When Christ saith, "I will be with you," you may add what you will; to protect you, to direct you, to comfort you, to carry on the work of grace in you, and in the end to crown you with immortality and glory. All this and more is included in this precious promise.