King James Bible
I find then a law, that, when I would do good, evil is present with me.

New King James Version
I find then a law, that evil is present with me, the one who wills to do good.

American Standard Version
I find then the law, that, to me who would do good, evil is present.

Berean Study Bible
So this is the principle I have discovered: When I want to do good, evil is right there with me.

Douay-Rheims Bible
I find then a law, that when I have a will to do good, evil is present with me.

English Revised Version
I find then the law, that, to me who would do good, evil is present.

World English Bible
I find then the law, that, to me, while I desire to do good, evil is present.

Young's Literal Translation
I find, then, the law, that when I desire to do what is right, with me the evil is present,

Romans 7:21 Additional Translations ...