James 1:22

But be ye doers of the word - They had heard this doctrine; they had believed it; but they had put it to no practical use. They were downright Antinomians, who put a sort of stupid, inactive faith in the place of all moral righteousness. This is sufficiently evident from the second chapter.

Deceiving your own selves - Παραλογιζομενοι ἑαυτους· Imposing on your own selves by sophistical arguments; this is the meaning of the words. They had reasoned themselves into a state of carnal security, and the object of St. James is, to awake them out of their sleep.

But be ye doers of the word, and not hearers only - Obey the gospel, and do not merely listen to it. Compare Matthew 7:21.

Deceiving your own selves - It is implied here, that by merely hearing the word but not doing it, they would deceive their own souls. The nature of this deception was this, that they would imagine that that was all which was required, whereas the main thing was that they should be obedient. If a man supposes that by a mere punctual attendance on preaching, or a respectful attention to it, he has done all that is required of him, he is laboring under a most gross self-deception. And yet there are multitudes who seem to imagine that they have done all that is demanded of them when they have heard attentively the word preached. Of its influence on their lives, and its claims to obedience, they are utterly regardless.