Success always necessitates a degree of ruthlessness. Given the choice of friendship or success, I'd probably choose success.

Never explain - your friends do not need it and your enemies will not believe you anyway.

Friendship... is not something you learn in school. But if you haven't learned the meaning of friendship, you really haven't learned anything.

Peace and friendship with all mankind is our wisest policy, and I wish we may be permitted to pursue it.

Friendship, like the immortality of the soul, is too good to be believed.

Friendship is always a sweet responsibility, never an opportunity.

Never make friends with people who are above or below you in status. Such friendships will never give you any happiness.

Friendship is a plant of slow growth and must undergo and withstand the shocks of adversity before it is entitled to the appellation.

As iron sharpens iron, so a friend sharpens a friend.

Sweet is the memory of distant friends! Like the mellow rays of the departing sun, it falls tenderly, yet sadly, on the heart.