Anglican Common Prayer: "A prayer for persons troubled in mind or conscience: ...give him a right understanding of himself, and of thy threats and promises; that he may neither cast away his confidence in thee, nor place it anywhere but in thee. Give him strength against all his temptation.... Break not the bruised reed, not quench the smoking flax. Shut not up thy tender mercies in displeasure; but make him to hear of joy and gladness.... Deliver him from fear of the enemy, and lift up the light of thy countenance upon him, and give him peace; through the merits and mediation of Jesus Christ our Lord. Amen."
I could have prayed this prayer for myself many times--and it is a prayer I can pray for others too--during times of depression, fear of loss of salvation, feelings of unworthiness, uncertainty of God's love. It is a truly practical prayer, for we all suffer from these states of mind from time to time, and some suffer much and often. But Your mercies, hope and joy ARE available!