The poet claims that the beloved's love and pity have healed and redeemed him entirely, making the poet indifferent to the world's judgment because the beloved's opinion is all that matters.
A mark or imprint left by external pressure. The beloved's love fills and replaces the imprints left by shame and public judgment.
Sonnet 112 operates within an economy of judgment. Earlier in the sequence, the poet worried endlessly about being inadequate to praise the beloved; now, the poet claims complete indifference to any judgment except the beloved's alone. This reversal is total: the poet's sense of self now entirely depends on a single observer rather than the public or even his own conscience. Self-worth cannot be self-generated—it must be conferred by another. The beloved becomes paradoxically both redeemer and source of complete dependence.
The beloved's 'love and pity' fills the poet's 'impression'—the mark or imprint left on the poet by circumstance and public shame is now overwritten by the beloved's grace. The image is of one mark replacing another: the world has imprinted shame on the poet, but the beloved's love erases this completely. There is no synthesis or negotiation—the beloved's judgment supplants all others. Redemption is total transformation. By Sonnet 112, love has become metaphysical necessity—the beloved is the ground of the poet's being.
When someone loves you unconditionally after you've failed and degraded yourself, and you find that their love becomes the only truth that matters—the world's judgment becomes irrelevant because theirs is the only judgment you can believe.