For you are saved by grace through faith, and this is not from yourselves; it is God’s gift—not from works, so that no one can boast. Eph. 2:8-9 (HCSB)
To take comfort from our good doings, or good feelings, or good plans, or good prayers, or good experiences, is to delude ourselves, and to say peace when there is no peace. No man can quench his thirst with sand, or with water from the Dead Sea; so no man can find rest from his own character however good, or from his own acts however religious.
Horatius Bonar, God’s Way of Peace: A Book for the Anxious, 20–21.