You are what you think.
A youth is to be regarded with respect. How do we know that his future will not be equal to our present?
The Master said, The gentleman understands what is right, whereas the petty man understands profit.
He that rules by mind is like the north star, steady in his seat, whilst the stars all bend to him.
The essence of knowledge is, having it, to apply it; not having it, to confess your ignorance.