Take steadily some one sin, which seems to stand out before thee, to root it out, by God's grace, and every fibre of it. Purpose strongly, by the grace and strength of God, wholly to sacrifice this sin or sinful inclination to the love of God, to spare it not, until thou leave of it none remaining, neither root nor branch. Fix, by God's help, not only to root out this sin, but to set thyself to gain, by that same help, the opposite grace. If thou art tempted to be angry, try hard, by God's grace, to be very meek; if to be proud, seek to be very humble.

Quoted in "Daily Strength For Daily Needs "