A.T. Robertson Commentary Romans 14:4

"Who art thou that judgest the servant of another? to his own lord he standeth or falleth. Yea, he shall be made to stand; for the Lord hath power to make him stand." — Romans 14:4 (ASV)

Who art thou? (συ τις ει?). Proleptic position of συ, "thou who art thou?"

The servant of another (αλλοτριον οικετην). Not another (αλλον) servant (household servant, οικετην), but "another's servant." For the adjective αλλοτριος, see Lu 16:12; 2 Corinthians 10:15f.

Shall be made to stand (σταθησετα). Future passive of ιστημ. In spite of your sharp criticisms of one another.

Hath power (δυνατε). Verb found only in Paul (2 Corinthians 9:8; 2 Corinthians 13:3; Romans 14:4), from verbal adjective δυνατος.