But let each man prove his own work, and then shall he have his glorying in regard of himself alone, and not of his neighbor.

Each one should test his own work. Then he will have reason to boast in himself alone, and not in someone else.

and his own work let each one prove, and then in regard to himself alone the glorying he shall have, and not in regard to the other,

but let each prove his own work, and then he will have his boast in what belongs to himself alone, and not in what belongs to another.