2 Peter 1:9

But he that lacketh these things. One in whom the graces mentioned by Peter are missing cannot intimately know Jesus, and is without the Light of the world. He is able to see the things of the world but is terribly shortsighted in respect to spiritual matters. He is, as the apostle says, “blind.”

Cannot see afar off. Gr. muopazo, “to be shortsighted,” whence our English word, “myopic.” Peter is speaking of professing Christians who have failed to add the desired virtues to their initial “faith” (v. 5). All such lack spiritual sight. They are dimly aware of spiritual values, but are incapable of perceiving their true value. They find it easier to see the things that are close at hand, the things of the world.

Purged ... sins. The incomplete Christian of whom Peter is speaking is so faulty that he has allowed the fact of his former justification, testified to by his baptism, to slip from his mind (cf. 1 Peter 2:24; 3:18). The person who forgets the cleansing of all the sins he committed up to the time of his justification is indeed in danger of rejecting the cross of Christ and of losing the basis for growth in spiritual knowledge and sanctification.