Commentaries:
Robertson's Word Pictures (NT)
Who art thou? (su tiv ei). Proleptic position of su, "thou who art thou?"
The servant of another (allotrion oikethn). Not another (allon) servant (household servant, oikethn), but "another's servant." For the adjective allotriov, see Luke 16:12; II Corinthians 10:15 f.
Shall be made to stand (staqhsetai). Future passive of isthmi. In spite of your sharp criticisms of one another.
Hath power (dunatei). Verb found only in Paul (II Corinthians 9:8; II Corinthians 13:3; Romans 14:4), from verbal adjective dunatov.
Other Robertson's Word Pictures (NT) entries containing Romans 14:4:
Romans 14:4
Romans 15:15
Romans 15:20
2 Corinthians 9:8
1 Timothy 5:22
James 4:12
1 Peter 2:18
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