Bear ye one another's burdens: every man shall bear his own burden. A kind of paradox of which Paul is fond. See Phi 2:12, Phi 2:13; 2Co 6:8-10; 2Co 7:10; 2Co 12:10. Paul means, no one will have occasion to claim moral superiority to his neighbor, for (γὰρ) each man's self-examination will reveal infirmities enough of his own, even though they may not be the same as those of his neighbor. His own burdens will absorb his whole attention, and will leave him no time to compare himself with others.
His own burden (τὸ ἴδιον φορτίον)
For ἴδιον own, see on 1Ti 6:1. With φορτίον burden comp. βάρη burdens, Gal 6:2. It is doubtful whether any different shade of meaning is intended. Originally βάρη emphasizes the weight of the burden, φορτίον simply notes the fact that it is something to be born (φέρειν), which may be either light or heavy. See Mat 11:30; Mat 23:4; Psa 37:4; Luk 11:46. Comp. Act 27:10, the lading of a ship.