As the saying goes, ‘like the mole in the eye, the stone in the shoe, the thorn in the foot, the faction in the home; is this ‘doubt in the brain’. When such doubts assail Arjuna, who is the representative Man, it means they are Humanity’s own doubts. They can be solved only by Madhava who is beyond and above Humanity. (GV, p. 61)

Do not admit doubt into you. Want of faith or steadiness is not as destructive as the venom of doubt.. (GV, p. 97)

Doubt grows wild in the absence of faith. Faith can be established only when one grasps the inner significance of each incident and remark.(SSS Vol.4, p. 31)

Doubting is truly a component of the Rakshasa nature. For it eats into the vitals of Bhakti. It clips the wings of joy; it dampens enthusiasm; it tarnishes hope. Such men cannot attain the goal even in the end of a thousand births.(SSS Vol.2, pp. 17-18)