“To talk about other people's affairs is a great mistake. To praise them, too, is unfttting. In any event, it is best to know your own ability well, to put forth effort in your endeavors, and to be discreet in speech.”
Hagakure (c. 1716)
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Tsunetomo Yamamoto 65
Samurai 1659–1719Related quotes

“Knowing your own darkness is the best method for dealing with the darknesses of other people.”
Variant: Knowing your own darkness is the best method for dealing with the darknesses of other people.
Source: How to Win Friends and Influence People (1936), p. 42 (in 2016 edition)

Hagakure (c. 1716)
Context: It is not good to settle into a set of opinions. It is a mistake to put forth effort and obtain some understanding and then stop at that. At first putting forth great effort to be sure that you have grasped the basics, then practicing so that they may come to fruition is something that will never stop for your whole lifetime. Do not rely on following the degree of understanding that you have discovered, but simply think, "This is not enough."
One should search throughout his whole life how best to follow the Way. And he should study, setting his mind to work without putting things off. Within this is the Way.

“Trust your own instinct. Your mistakes might as well be your own, instead of someone else's.”

"Supplement to Bougainville's Voyage" (1796)
Variant translation:
Never allow yourselves to forget that it is for their own sakes and not for yours that all those wise lawgivers have forced you into your present unnatural and rigid molds. And as evidence of this, I need only produce all our political, civil, and religious institutions. Examine them thoroughly, and either I am very much mistaken or you will find that mankind has been forced to bow, century after century, beneath a mere handful of scoundrels has conspired, in ever age, to impose upon it. Beware of the man who wants to set things in order. Setting things in order always involves acquiring mastery over others — by tying them hand and foot.
As translated by Derek Coleman, in Diderot's Selected Writings (1966)
Context: As for our celebrated lawgivers, who have cast us in our present awkward mold, you may be sure that they have acted to serve their interests and not ours. Witness all our political, civil, and religious institutions — examine them thoroughly: unless I am very much mistaken, you will see how, through the ages, the human race has been broken to the halter that a handful of rascals were itching to impose. Watch out for the fellow who talks about putting things in order! Putting things in order always means getting other people under your control.