One's friends are that part ...

One\'s friends are that part of the human race with which one can be human.
One's friends are that part of the human race with which one can be human.

Quotes from the same author

America is a young country with an old mentality.
Friendship is almost always the union of a part of one mind with the part of another; people are friends in spots.
Those who cannot learn from history are doomed to repeat it.
Saints cannot arise where there have been no warriors, nor philosophers where a prying beast does not remain hidden in the depths.
Men almost universally have acknowledged providence, but that fact has had no force to destroy natural aversions and fears in the presence of events.