From the Bible:
In the Gospel of St. Mark, Chapter 10, we read a passage that Yogananda often quoted:
And they brought young children to him, that he should touch them: and his disciples rebuked those that brought them.
But when Jesus saw it, he was much displeased, and said unto them, Suffer the little children to come unto me, and forbid them not: for of such is the kingdom of God.
Verily I say unto you, Whosoever shall not receive the kingdom of God as a little child, he shall not enter therein.
From the Bhagavad Gita, ninth Chapter:
To you, who are free from the carping spirit, I shall now reveal wisdom sublime. Grasping it with your mind, and perceiving it by intuitive realization, you shall escape the evils of delusion.