He has perpetually occasion to rely on ideas which he has not had leisure to search to the bottom; for he is much more frequently aided by the opportunity of an idea than by its strict accuracy; and, in the long run, he risks less in making use of some false principles, than in spending his time in establishing all his principles on the basis of truth.

The world is not led by long or learned demonstrations; a rapid glance at particular incidents, the daily study of the fleeting passions of the multitude, the accidents of the time, and the art of turning them to account, decide all its affairs.
In the ages in which active life is the condition of almost everyone, men are therefore generally led to attach an excessive value to the rapid bursts and superficial conceptions of the intellect; and, on the other hand, to depreciate below their true standard its slower and deeper labors.

This opinion of the public influences the judgment of the men who cultivate the sciences; they are persuaded that they may succeed in those pursuits without meditation, or deterred from such pursuits as demand it.
There are several methods of studying the sciences.

Amongst a multitude of men you will find a selfish, mercantile, and trading taste for the discoveries of the mind, which must not be confounded with that disinterested passion which is kindled in the heart of the few.

A desire to utilize knowledge is one thing; the pure desire to know is another.
I do not doubt that in a few minds and far between, an ardent, inexhaustible love of truth springs up, self-supported, and living in ceaseless fruition without ever attaining the satisfaction which it seeks.