John Calvin Commentary 2 Peter 3:12

"looking for and earnestly desiring the coming of the day of God, by reason of which the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?" — 2 Peter 3:12 (ASV)

Looking for and hasting unto, or, waiting for by hastening; so I render the words, though they are two participles. For what he previously presented separately, he now gathers into one statement, that is, that we should hastily wait. Now this paradoxical hope possesses considerable elegance, like the proverb, “Hasten slowly” (festina lente).

When he says, “Waiting for,” he refers to the endurance of hope, and he sets hastening in opposition to torpor; and both are very fitting. For as quietness and waiting are the characteristics of hope, so we must always be careful that the security of the flesh does not creep in; we should, therefore, strenuously labor in good works, and run quickly in the race of our calling.

What he previously called the day of Christ (as it is everywhere called in Scripture) he now calls the day of God, and rightly so, for Christ will then restore the kingdom to the Father, that God may be all in all.