Power acquired by violence is only a usurpation, and lasts only as long as the force of him who commands prevails over that of those who obey.
Interpretation
Violent power is illegitimate and unstable, reliant on force rather than true authority.
Denis Diderot's quote emphasizes that power gained through violence is not legitimate; it is merely a seizure of control that can easily crumble when the coercive force is diminished. True authority is built on consent and the willingness of others to follow rather than through intimidation or fear.
In practice
In a speech on leadership, you might quote Diderot to emphasize the importance of ethical governance.
The arbitrary rule of a just and enlightened prince is always bad. His virtues are the most dangerous and the surest form of seduction: they lull a people imperceptibly into the habit of loving, respecting, and serving his successor, whoever that successor may be, no matter how wicked or stupid.
This root [the potato], no matter how much you prepare it, is tasteless and floury. It cannot pass for an agreeable food, but it supplies a food sufficiently abundant and sufficiently healthy for men who ask only to sustain themselves. The potato is criticized with reason for being windy, but what matters windiness for the vigorous organisms of peasants and laborers?
Do you see this egg? With this you can topple every theological theory, every church or temple in the world.
There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.
In order to get as much fame as one's father one has to much more able than he.
All abstract sciences are nothing but the study of relations between signs.
Let America be America again. Let it be the dream it used to be.
Is death the last sleep? No, it is the last and final awakening.
Abba Moses asked Abba Sylvanus, Can a person lay a new foundation every day? The old man replied, If you work hard, you can lay a new foundation every moment. Abba Pimen said, To throw yourself before God, not to measure your progress, to leave behind all self-will; these are the instruments for the work of the soul. The desire to rule is the mother of heresies.
One of the things I have noticed about my novels is that they all concern people who can't quite bring themselves to tell the truth about their own lives... I've come to realise that this interest in damaged, untellable stories comes from my parents.
Someday no one will remember that she ever existed, I wrote in my notebook, and then, or that I did. Because memories fall apart, too. And then you're left with nothing, left not even with a ghost but with its shadow. In the beginning, she had haunted me, haunted my dreams, but even now, just weeks later, she was slipping away, falling apart in my memory and everyone else's, dying again.
If we look back into history for the character of the present sects in Christianity, we shall find few that have not in their turns been persecutors, and complainers of persecution. The primitive Christians thought persecution extremely wrong in the Pagans, but practised it on one another.
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