Charles Spurgeon Commentary James 1:23-25

"For if any one is a hearer of the word and not a doer, he is like unto a man beholding his natural face in a mirror: for he beholdeth himself, and goeth away, and straightway forgetteth what manner of man he was. But he that looketh into the perfect law, the [law] of liberty, and [so] continueth, being not a hearer that forgetteth but a doer that worketh, this man shall be blessed in his doing." — James 1:23-25 (ASV)

For if any be a hearer of the word, and not a doer, he is like unto a man beholding his natural face in a glass: for he beholdeth himself, and goeth his way, and straightway forgetteth what manner of man he was. But whoso looketh into the perfect law of liberty, and continueth therein,

Perseverance to the end is needed: Continueth therein.