While you may in charity assume that a Christian brother acts from pure motives, you dare not assume that your own heart is upright. You must be more charitable to others than you are to yourself. You have no access to a fellow Christian’s heart. No ability to test his inward devotion to the Lord, which is the all-important matter in using things indifferent. But you can scrutinize your own heart. You can examine your inner man to detect your own motives and aims for every act.