He wishes again to assure you he will pray for your
spiritual advancement in the Holy Shrines. The power of God can entirely
transmute our characters and make of us beings entirely unlike our previous
selves. Through prayer and supplication, obedience to the divine laws
Bahá'u'lláh has revealed, and ever-increasing service to His Faith, we can change
ourselves.
(From a letter dated 22 November 1941 written on behalf of Shoghi
Effendi to an individual believer; The Compilation of Compilations, Vol. II,
The Importance of Prayer, Meditation and the Devotional Attitude)