10. Another circumstance connected with this subject is, that the moral sentiments and feelings above all others, are improved and strengthened by exercise; and are weakened, and often destroyed by disregard or opposition.--Every instance of moral exercise or moral discipline, invigorates the executive powers of conscience, and renders the moral perceptions of the person more acute and tender. Every successful struggle against a temptation, implants in the mind of a child a noble consciousness of dignity, and confers a large amount of moral strength, and a firmer determination to resist others. In this respect, the good derived from the mere knowledge of a duty and its actual performance is immense. A child who is merely told that a certain action is praiseworthy, is by no means so sensible of the fact, or of its value, as he is after he has actually performed it; and when, on the contrary, he is told that a certain action is wrong, he is no doubt prepared to avoid it; but it is not till he has been tempted to its commission, and has successfully overcome the temptation, that he is fully aware of its enormity. When he has successfully resisted the first temptation, he is much better prepared than any exhortation or warning could make him for resisting and repelling a second;--while every successive victory will give strength to the executive powers of the conscience, and will render future conflicts less hazardous, and resistance more easy. For the same reason, an amiable action frequently performed does not pall by repetition, but appears more and more amiable, till the doing of it grows into a habit; and the approval of conscience becoming every day more satisfactory, the person will be stimulated to its frequent and regular observance. But the opposite of this is equally true.--The continued habit of suppressing the voice of conscience will greatly weaken, and will at last destroy its executive powers. When a person knows that a certain action is wrong, and is tempted to commit it,--conscience will speak out, and for the first time at least it will be listened to. But if this warning be neglected, and the sin be committed, the conscience will be proportionally weakened, and the self-will of the individual will acquire additional strength. When the temptation again presents itself, it is with redoubled power, and it meets with less resistance. It will invariably be found in such cases, that the person felt much more difficulty in resisting the admonitions of conscience in the case of the first temptation, than in that of the second; and he will also feel more during the second than he will during the third. Frequent resistance offered to the executive powers of conscience will at last lay them asleep. The beginning of this downward career is always the most difficult; but when once fairly begun, it grows every day more easy, till the habit of sin becomes like a second nature.