Advice: Do not do these things

Inscribed on the walls

of an ancient Persian temple
are these thoughts:

Do not say all you know,
for he who says all he knows
often says more than he knows.

Do not tell all you hear,
for he who tells all he hears
often tells more than he hears.

Do not spend all you have,
for he who spends all he has
often spends more than he has.

Do not covet all you see,
for he who covets all he sees
often wants more than he sees.
 

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From appleseeds