Jerry Bridges, The Discipline of Grace (p. 19):

Your worst days are never so bad that you are beyond the reach of God's grace.

And your best days are never so good that you are beyond the need of God's grace.

And from pp. 22-23:

Pharisee-type believers unconsciously think they have earned God's blessing through their behavior.

Guilt-laden believers are quite sure they have forfeited God's blessing through their lack of discipline or their disobedience.

Both have forgotten the meaning of grace because they have moved away from the gospel and have slipped into a performance relationship with God.

HT: Tullian