When you design to ask any one's advice, consider how he has acted in his own behalf. 
Variant: Whenever you are proposing to take anyone's advice about your affairs, first look to see how he manages his own; for the man of defective judgment in his own business will never give good counsel about that of others.
(Letter to Demonicus)


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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)

Aim at immortality by your heroic actions; but let your conduct be so prudent, that you never become forgetful of mortality.

Isocrates (Letter to Demonicus)

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