"Those who have wept and laughed together are no longer strangers." ~~ Max Nordau
"No man knows what is in his friend’s heart." ~~ Talmud, Pesachim
"If you do not pity your friend, nobody will pity you." ~~ Tanchuma
"Your enemies you have to take, wherever and however you find them; but fortunately, I can choose my friends. " ~~ Arthur Schnitzler
"Friendship is like a treasury: you cannot take from it more than you put into it." ~~ Benjamin Mandelstamm
"Faithful are the words of a friend; but the kisses of an enemy are deceitful. " ~~ Proverbs (Mishle) 27:6
"Press not your friend to dine with you when you know that he dines not, nor offer him many gifts when you know that he accepts them not! " ~~ Talmud, Chullin
"Whoso asks forgiveness from a friend should not plead more than thrice." ~~ Talmud, Yoma 1624
"If you believe all gossip around you, you will be left without one good friend. " ~~ Ben Shlomo Immanuel
"Let not a thousand friends seem too many in your eyes." ~~ Ibn Gabirol
"A friend in the market is better than gold in the chest." ~~ Levi Ben Gershon
"Who visits a sick friend lessens his pain a little." ~~ Talmud, Nedarim