Adam Clarke on Matthew 19:23

A rich man shall hardly enter - That is, into the spirit and privileges of the Gospel in this world, and through them into the kingdom of glory. Earthly riches are a great obstacle to salvation; because it is almost impossible to possess them, and not to set the heart upon them; and they who love the world have not the love of the Father in them. 1Jn 2:15. To be rich, therefore, is in general a great misfortune: but what rich man can be convinced of this? It is only God himself who, by a miracle of mercy, can do this. Christ himself affirms the difficulty of the salvation of a rich man, with an oath, verily; but who of the rich either hears or believes him!