Prayer of St. Ephrem Syrian (about faint-heartedness)

O Lord and Master of my life! Take from me the spirit of sloth, faint-heartedness, lust of power, and idle talk. But give rather the spirit of chastity, humility, patience, and love to Thy servant. Yea, O Lord and King! Grant me to see my own errors and not to judge my brother; For Thou art blessed unto ages of ages. Amen

The result of  sloth is faint-heartedness. It is the state of despondency which all spiritual Fathers considered the greatest danger for the soul. Despondency is the impossibility for man to see anything good or positive; it is the reduction of everything to negativism and pessimism. It is truly a demonic power in us because the Devil is fundamentally a liar. He lies to man about God and about the world; he fills life with darkness and negation. Despondency is the suicide of the soul because when man is possessed by it he is absolutely unable to see the light and to desire it.

(By Protopresbyter Alexander Schmemann)