There was a definite process by which one made people into friends, and it involved talking to them and listening to them for hours at a time.
Rebecca West (1892 - 1983)
Reveal not every secret you have to a friend, for how can you tell but that friend may hereafter become an enemy. And bring not all mischief you are able to upon an enemy, for he may one day become your friend.
Saadi (1184 - 1291)