Take heed lest excessive reading and too many acts of piety in the daytime and in the night season make you vainglorious. Should a person recite but a single verse from the Holy Writings in a spirit of joy and radiance, this would be better for him than reciting wearily all the Scriptures of God, the Help in Peril, the Self-Subsisting. Recite ye the verses of God in such measure that ye be not overtaken with fatigue or boredom. Burden not your souls so as to cause exhaustion and weigh them down, but rather endeavour to lighten them, that they may soar on the wings of revealed Verses unto the dawning-place of His signs. This is conducive to nearer access unto God, were ye to comprehend.
(Bahá’u’lláh, The Compilation of Compilations vol II, p. 225)