John Wesley on 2 Corinthians 1:22

Who also hath sealed us - Stamping his image on our hearts, thus marking and sealing us as his own property. And given us the earnest of his Spirit - There is a difference between an earnest and a pledge. A pledge is to be restored when the debt is paid; but an earnest is not taken away, but completed. Such an earnest is the Spirit. The first fruits of it we have Rom 8:23; and we wait for all the fulness.