Choose two moments only for speaking, the one when you know the subject well, the other when it is necessary to speak about it. These are the only occasions on which speech is better than silence; on all others it is better to be silent than to speak.
(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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