OET interlinear YAC (JAM) 4:14

uW Translation Notes:

Note 1 topic: figures-of-speech / rquestion

οἵτινες οὐκ ἐπίστασθε τὸ τῆς αὔριον, ποία ἡ ζωὴ ὑμῶν?

(Some words not found in SR-GNT: Οἵτινες οὐκ ἐπίστασθε τῆς αὔριον ποία γάρ ζωή ὑμῶν ἀτμίς Γάρ ἐστέ ἡ πρός ὀλίγον φαινομένη ἔπειτα καί ἀφανιζομένη)

James is using the question form to challenge and teach his readers. If it would be helpful in your language, you could express this question by translating his words as a statement or an exclamation. Alternate translation: [You do not know what will happen tomorrow, and you may not even be alive then!]

Note 2 topic: figures-of-speech / metaphor

ἀτμὶς γάρ ἐστε, ἡ πρὸς ὀλίγον φαινομένη, ἔπειτα καὶ ἀφανιζομένη

(Some words not found in SR-GNT: Οἵτινες οὐκ ἐπίστασθε τῆς αὔριον ποία γάρ ζωή ὑμῶν ἀτμίς Γάρ ἐστέ ἡ πρός ὀλίγον φαινομένη ἔπειτα καί ἀφανιζομένη)

James is speaking of his readers as if they were a mist that forms briefly in the morning but then quickly dissipates when the sun rises. In your translation you could explain the meaning of this image, or you could represent it as a simile, as UST does. Alternate translation: [For you will only be alive for a short time, and then you will die]