Adam Clarke on Romans 14:4

Who art thou that judgest another man's servant? - Who has ever given thee the right to condemn the servant of another man, in things pertaining to his own master? To his own master he standeth or falleth. He is to judge him, not thou; thy intermeddling in this business is both rash and uncharitable.

Yea, he shall be holden up - He is sincere and upright, and God, who is able to make him stand, will uphold him; and so teach him that he shall not essentially err. And it is the will of God that such upright though scrupulous persons should be continued members of his Church.