What are the aims which are at the same time duties? They are perfecting of ourselves, the happiness of others.

That Logic has advanced in this sure course, even from the earliest times, is apparent from the fact that, since Aristotle, it has been unable to advance a step, and thus to all appearance has reached its completion.

Of all the arts poetry (which owes its origin almost entirely to genius and will least be guided by precept or example) maintains the first rank.

Fallacious and misleading arguments are most easily detected if set out in correct syllogistic form.

Enthusiasm is always connected with the senses, whatever be the object that excites it. The true strength of virtue is serenity of mind, combined with a deliberate and steadfast determination to execute her laws. That is the healthful condition of the moral life; on the other hand, enthusiasm, even when excited by representations of goodness, is a brilliant but feverish glow which leaves only exhaustion and languor behind.

It is often necessary to make a decision on the basis of knowledge sufficient for action but insufficient to satisfy the intellect.

Thoughts without content are empty, intuitions without concepts are blind... The understanding can intuit nothing, the senses can think nothing. Only through their union can knowledge arise.