Make no man a friend before inquiring how he has treated his former friends; expect him to behave to you as he has behaved to them.
Variant: Admit no one into your friendship, before you have inquired diligently how he has behaved to his former friend.
(Letter to Demonicus)

Isocrates

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Never emulate those who gain by injustice.

Isocrates (Letter to Demonicus)

If you be a lover of instruction, you will be well instructed.

Isocrates (Ad Doemonicum)

When you design to ask any one's advice, consider how he has acted in his own behalf. 

Isocrates (Letter to Demonicus)

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