Obstinacy, sir, is certainly ...

Obstinacy, sir, is certainly a great vice; and in the changeful state of political affairs it is frequently the cause of great mischief. It happens, however, very unfortunately, that almost the whole line of the great and masculine virtues--constancy, gravity, magnanimity, fortitude, fidelity, and firmness--are closely allied to this disagreeable quality, of which you have so just an abhorrence; and in their excess all these virtues very easily fall into it.
Obstinacy, sir, is certainly a great vice; and in the changeful state of political affairs it is frequently the cause of great mischief. It happens, however, very unfortunately, that almost the whole line of the great and masculine virtues--constancy, gravity, magnanimity, fortitude, fidelity, and firmness--are closely allied to this disagreeable quality, of which you have so just an abhorrence; and in their excess all these virtues very easily fall into it.

Quotes from the same author

But what is liberty without wisdom, and without virtue? It is the greatest of all possible evils; for it is folly, vice, and madness, without tuition or restraint.
Nobody made a greater mistake than he who did nothing because he could do only a little.
The people never give up their liberties but under some delusion.
But the age of chivalry is gone. That of sophisters, economists, and calculators has succeeded; and the glory of Europe is extinguished forever.
Early and provident fear is the mother of safety.