He who goes into a crowd must now go one way and then another, keep his elbows close, retire or advance, and quit the straight way, according to what he encounters; and must live not so much according to his own method as to that of others; not according to what he proposes to himself, but according to what is proposed to him, according to the time, according to the men, according to the occasions. Plato says, that whoever escapes from the world's handling with clean breeches, escapes by miracle.

Montaigne

Friendships that are purely of our own acquiring ordinarily carry it above those to which the communication of climate or of blood oblige us. Nature has placed us in the world free and unbound; we imprison ourselves in certain straits.

Montaigne