John Trapp Complete Commentary
Isaiah 59:12
For our transgressions are multiplied before thee, and our sins testify against us: for our transgressions [are] with us; and [as for] our iniquities, we know them;
Ver. 12. For our transgressions are multiplied before thee.] When complaints end in confessions, it is right - the medicine worketh kindly. Some furious fools have brutish and fell affections, full of rage; when in pain or grief, they fly upon God and man, and all that comes next hand, hoping to ease themselves, not by confession or reformation, but by revenge.
And our sins testify against us.] a Sin put a sting into their cresses, and hence it was they lay so heavy. This brought such roarings and groanings upon them, and that also when salvation was looked for.
For our transgressions are with us.] They lie like a load of lead upon our consciences, where they are yet unpardoned.
And as for our iniquities, we know them.] Our consciences are burdened with them, and we feel the terrors of God in our souls. Conscientia nihil aliud est quam cordis scientia; Conscience is the reflection of the soul upon itself. See 1 Corinthians 4:4. So here, "As for our iniquities, we know them" - namely, by a second act of the understanding, whereby, after we think or know a thing, we think what we think, and know what we know, and this is properly the action of conscience.
a Heb., Peccatum respondit - i.e., Peccatorum unumquodque.