Here’s William Tyndale’s great description of the sufficiency of Christ’s death on the cross.
GOD anointed his Son Jesus with the Holy Ghost, and therefore called him Christ; which is as much to say as anointed. Outwardly he disguised him not; but made him like other men, and sent him into the world to bless us, and to offer himself for us a sacrifice of a sweet savor, to kill the stench of our sins, that God henceforth should smell them no more, nor think on them any more; and to make full and sufficient satisfaction, or amends, for all them that repent, believing the truth of God, and submitting themselves unto his ordinances, both for their sins that they do, have done, and shall do. For sin we through fragility never so oft, yet as soon as we repent and come into the right way again, and unto the testament [covenant] which God hath made in Christ’s blood, our sins vanish away as smoke in the wind, and as darkness at the coming of light; or as thou castest a little blood, or milk, into the main sea: insomuch that whosoever goeth about to make satisfaction for his sins to God-ward, saying in his heart, This much have I sinned, this much will I do again; or this-wise will I live to make amends withal; or this will I do, to get heaven withal; the same is an infidel, faithless, and damned in his deed-doing, and hath lost his part in Christ’s blood; because he is disobedient unto God’s testament, and setteth up another of his own imagination, unto which he will compel God to obey. If we love God, we have a commandment to love our neighbor also, as saith John in his epistle; and if we have offended him, to make him amends; or if we have not wherewith, to ask him forgiveness, and to do and suffer all things for his sake, to win him to God, and to nourish peace and unity. But to God-ward Christ is an everlasting satisfaction, and ever sufficient.
This quote can be found in “The Obedience of a Christian Man” (found, among other places, in The Works of William Tyndale).