Benjamin Franklin

All of these are from Poor Richard's Almanack
1737 The nearest way to come at glory, is to do that for conscience which we do for glory.
1739 If thou injurest Conscience, it will have its Revenge on thee.
1741 Let no Pleasure tempt thee, no Profit allure thee, no Ambition corrupt thee, no Example sway thee, no Persuasion move thee, to do any thing which thou knowest to be Evil; So shalt thou always jollily: for a good Conscience is a continual Christmas. Adieu.