The Lord Jesus Christ knew full well the unspeakable importance of His own death for sin as the great corner-stone of Scriptural religion. He knew that His own satisfaction for sin as our Substitute, His suffering for sin, the Just for the unjust, His payment of our mighty debt in His own Person, His complete redemption of us by His blood, He knew that this was the very root of soul-saving and soul-satisfying Christianity—without this He knew His incarnation, miracles, teaching, example, and ascension could do no good to man; without this He knew there could be no justification, no reconciliation, no hope, no peace between God and man. Knowing all this, He took care that His death, at any rate, should never be forgotten. He carefully appointed an ordinance, in which, by lively figures, His sacrifice on the Cross should be kept in perpetual remembrance...The strengthening of the faith of God’s elect in Christ’s atonement was one great purpose of the Lord’s Supper.
— J. C. Ryle, from Knots Untied