A passage from Diogenes Laertius
Diogenes Laertius, Lives 7.23
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When someone asked Zeno what a friend was, he replied, 'Another I.'
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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It is a man's special privilege to love even those who wrong him.
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Never value anything as profitable to thyself which shall compel thee to break thy promise, to lose thy self-respect, to hate any man, to suspect, to curse, to act the hypocrite, to desire anything which needs walls and curtains.