Bear (endure, carry) one another's burdens and troublesome moral faults, and in this way fulfill and observe perfectly the law of Christ (the Messiah) and complete what is lacking [in your obedience to it].
WE WHO are strong [in our convictions and of robust faith] ought to bear with the failings and the frailties and the tender scruples of the weak; [we ought to help carry the doubts and qualms of others] and not to please ourselves.
But I have prayed especially for you [Peter], that your [own] faith may not fail; and when you yourself have turned again, strengthen and establish your brethren.