Pythagoras defines friendship as the mother of all virtues; therefore only those who tend towards virtue, who has the germ of goodness within him can make friends.
In relations with others do not act so as to make enemies friends, but friends make enemies.
Platon: God created friends. God brings his friend to his friend. - Only someone who is a friend of himself, who has a friendly relationship with himself, can be a friend of another person. - The friend is similar to the like: that is, that the only good friend is the sole good, while bad never contracted a friendship with neither good nor in bad. - I'll be with you for sure if, trying needed mutual friendship try to do something good; but as long as you are to wish evil, calls to help someone else.
Plutarch: I do not need a friend who changes when I change and nods when I nod; my shadow makes it much better.
Epicurus: Friendship is the most important wisdom was in Serbia to achieve the blessing of a life fully lived. - Friendship gives security, free from fear and it is essential to true happiness. - Friendship dancing along the earth, bringing us all the call to open our eyes to the happiness. - Of all the things that the prosecution wisdom for a happy existence, the largest is the friendship. - The man is sincerely lives mainly in the wisdom and friendship, one mortal good, the other immortal good.
Aristotle: The basic functions because the friendship that the friend you want the happiness, he goes to meet with kindness and confidence between the two arises. - Friendship is one soul living in more bodies. - Without friends no one would choose to live, though he had all other goods. - You decide in a hurry to be friends, but friendship is a fruit that ripens slowly. - A man could possess all the riches of the world, but if he does not have friends with whom to share it, it is as if he had nothing. - How to deal with friends? As we would have them do to us.
Cicero: Friendship is like the sun that illuminates the lives of people, "Delete the sun from the sky who remove friendship from their lives." - The true friend you recognize it in time of danger. - The true friend is another self. - Life is nothing without friendship. - The true friendships are eternal.
Goethe: How empty the world if it would represent only mountains, rivers and cities! But knowing that here and there is someone who is in harmony with us, with which, even in silence, we continue to live, just that transformed this land into an inhabited garden.
R. W. Emerson: The glory of friendship is not the outstretched hand, nor the kindly smile nor the joy of companionship is spiritual aspiration when we discover that someone believes in us and is willing to trust us.
Francis Quarler - Friendship is like music: two strings tuned similarly vibrate together even if they touch one.