Nature has no moods. They belong to man alone

Only what thou art in thyself determines thy value, not what thou hast.

He who possesses a firm faith, although in solitude, is not alone.

Being alone when one’s belief is firm, is not to be alone.

Books make men alone for themselves.

Perfect solitude is when, for a whole day, no human eye has beheld your face.

It lies in our own power to attune the mind to cheerfulness.