The Supersoul, the Supreme Personality of Godhead, is the source of light.
Bhagavad Gita 13.18,
Faith means… unflinching trust in something sublime.
Bhagavad Gita 2.41,
Ignorant and faithless persons who doubt the revealed scriptures do not attain God consciousness; they fall down. For the doubting soul there is happiness neither in this world nor in the next.
Wherever there is Krishna the master of all mystics, and wherever there is Arjuna, the supreme archer, there will also certainly be opulence, victory, extraordinary power, and morality.
Bhagavad Gita 18.78
If one offers Me with love and devotion a leaf, a flower, fruit or water, I will accept it.
Bhagavad Gita 9.26
By all the Vedas, I am to be known. Indeed, I am the compiler of Vedanta, and I am the knower of the Vedas.
Bhagavad Gita 15.15