At length I pass to the remaining portion of my Ethics, which is concerned with the way leading to freedom.

I shall therefore treat therein of the power of the reason, showing how far the reason can control the emotions, and what is the nature of Mental Freedom or Blessedness; we shall then be able to see, how much more powerful the wise man is than the ignorant.

It is no part of my design to point out the method and means whereby the understanding may be perfected, nor to show the skill whereby the body may be so tended, as to be capable of the due performance of its functions.

The latter question lies in the province of Medicine, the former in the province of Logic.

Here, therefore, I repeat, I shall treat only of the power of the mind, or of reason; and I shall mainly show the extent and nature of its dominion over the emotions, for their control and moderation.
That we do not possess absolute dominion over them, I have already shown.