OET interlinear YAC (JAM) 1:4

uW Translation Notes:

Note 1 topic: figures-of-speech / personification

ἡ δὲ ὑπομονὴ ἔργον τέλειον ἐχέτω

¬the (Some words not found in SR-GNT: ἡ Δέ ὑπομονή ἔργον τέλειον ἐχέτω ἵνα ἦτε τελειοῖ καί ὁλόκληροι ἐν μηδενί λειπόμενοι)

The expression let endurance have a perfect work means “let endurance complete its work.” James is speaking as if the quality of endurance were actively developing the character of believers. Alternate translation: [But make sure that you completely develop the ability not to give up]

Note 2 topic: figures-of-speech / doublet

τέλειοι καὶ ὁλόκληροι

(Some words not found in SR-GNT: ἡ Δέ ὑπομονή ἔργον τέλειον ἐχέτω ἵνα ἦτε τελειοῖ καί ὁλόκληροι ἐν μηδενί λειπόμενοι)

The words perfect and whole mean similar things. James is using them together for emphasis. In this context, the word perfect does not mean without any flaws. Rather, it refers to something that has reached its goal. The word whole describes something that is not missing any of its parts or pieces. Together, the words describe mature Christian character. If it would be helpful in your language, you could express this idea by translating this pair of words with a single expression. Alternate translation: [completely mature]

Note 3 topic: figures-of-speech / doublenegatives

ἐν μηδενὶ λειπόμενοι

in (Some words not found in SR-GNT: ἡ Δέ ὑπομονή ἔργον τέλειον ἐχέτω ἵνα ἦτε τελειοῖ καί ὁλόκληροι ἐν μηδενί λειπόμενοι)

This is a double negative, consisting of the negative verb lacking and the negative object nothing. If it would be clearer in your language, you could use a positive expression to translate this. Alternate translation: [having all that you need] or [being all that you need to be]