every one not endeavouring, or not being able, by the contemplation of remote and future good, to raise in himself desires of them strong enough to counterbalance the uneasiness he feels in those bodily torments, and to keep his will steady in the choice of those actions which lead to future happiness.
 John Locke, An Essay Concerning Human Understanding (1689). copy citation

Context

“which, when present and violent, operate for the most part forcibly on the will, and turn the courses of men’s lives from virtue, piety, and religion, and what before they judged to lead to happiness; every one not endeavouring, or not being able, by the contemplation of remote and future good, to raise in himself desires of them strong enough to counterbalance the uneasiness he feels in those bodily torments, and to keep his will steady in the choice of those actions which lead to future happiness. A neighbouring country has been of late a tragical theatre from which we might fetch instances, if there needed any, and the world did not in all countries and ages furnish examples enough to confirm that received observation:” source