“Come, Let Us Reason Together” — The Conditional Grace Critics Always Drop
Isaiah 1:18 is quoted constantly: “Though your sins be as scarlet, they shall be as white as snow.” The verse before and after it — which contain the conditions — are almost never quoted.
The Full Passage
Here is what Isaiah 1:16–20 actually says:
“Wash you, make you clean; put away the evil of your doings from before mine eyes; cease to do evil; Learn to do well; seek judgment, relieve the oppressed, judge the fatherless, plead for the widow. Come now, and let us reason together, saith the LORD: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool. If ye be willing and obedient, ye shall eat the good of the land: But if ye refuse and rebel, ye shall be devoured with the sword: for the mouth of the LORD hath spoken it.”
The famous line — “though your sins be as scarlet” — sits inside a five-verse unit. It cannot be extracted without distorting it.
The Conditions
The scarlet-to-white promise is bracketed on both sides:
Before it — a sequence of imperatives: wash, make clean, put away evil, cease evil, learn to do well, seek judgment, relieve the oppressed, judge the fatherless, plead for the widow. These are not suggestions. They are commands. They are the context in which forgiveness is offered.
After it — an explicit conditional: “If ye be willing and obedient, ye shall eat the good of the land: But if ye refuse and rebel, ye shall be devoured with the sword.”
The grace is real. The conditions are also real. Both are in the text. A reading that honors this passage must honor both simultaneously.
How the Verse Is Misused
The quotation as commonly deployed:
How It Is Typically Quoted
“Though your sins be as scarlet, they shall be as white as snow.” — full stop.
The “if ye be willing and obedient” clause is omitted. The imperatives are omitted. The “if ye refuse and rebel” consequence is omitted. What was a promise with conditions becomes an unconditional promise. What was a covenant invitation becomes a blank check.
This is not what Isaiah said. To quote a conditional promise as if it were unconditional is not interpretation — it is editing.
The Gospel of Jesus Christ Preserves Both
The Atonement of Jesus Christ is infinite in its reach and genuine in its power. Grace is real. The forgiveness of sins is real. AND — the recipient must be willing and obedient. Not to earn forgiveness through perfect performance, but because the covenant itself requires a willing, turned heart.
“It is by grace that we are saved, after all we can do.”
After. Not instead of. The restoration of the full covenant framework — obedience and grace together — is exactly what Isaiah 1 describes. The restored Gospel does not choose between the two halves of Isaiah’s promise. It insists on both.
Verdict
Isaiah 1:18 is a conditional promise. The condition is willing obedience. The consequence of rebellion is explicitly stated in verse 20.
A gospel that quotes the promise without the condition has not proclaimed Isaiah — it has edited him. The invitation to “reason together” is an invitation to engage the full text, including the parts that require something of the hearer.
Let us reason together, saith the Lord — and that reasoning includes the “if” that follows.