There are particular besetting sins, of which each separate Christian can alone furnish an account; every single person has some weak point, each person has a thin, weak spot in their wall of defense against the devil, each person has a traitor in their camp ready to open the gates to Satan, and they who are wise will never rest until they have discovered where this weak point is. This is that special sin which you are exhorted to watch against, to overcome, to cast forth, to spare no means in bringing it into subjection—that it may not entangle you in your race towards Zion. One person is beset with lust, another with a love of drinking, another with evil temper, another with malice, another with covetousness, another with worldly-mindedness, another with idleness—but each of us has got about them some besetting infirmity, which is able to hinder them far more than others, and with which they must keep an unceasing warfare—or else they will never so run as to obtain the prize.
~ J.C. Ryle
Tract:The Christian Race