If you pour oil and vinegar into the same vessel, you would call them not friends but opponents.
AeschylusYou are important to this earth. If you were meant to journey alone, you would not have friends...
Virginia AlisonWhen a sinister person means to be your enemy, they always start by trying to become your friend.
William BlakeOur friends are generally ready to do everything for us, except the very thing we wish them to do.
William Hazlitt