2. A second Psychological question, regarded by many (notably by Kant)
as vitally implicated in Moral Obligation, is the Freedom of the Will.
The history of opinion on this subject has been in great part already
given.

3. Thirdly, It has been debated, on Psychological grounds, whether our
Benevolent actions (which all admit) are ultimately modes of
self-regard, or whether there be, in the human mind, a source of
purely Disinterested conduct. The first view, or the reference of
benevolence to Self, admits of degrees and varieties of statement.

(1) It may be held that in performing good actions, we expect and
obtain an immediate reward fully equivalent to the sacrifice made.
Occasionally we are rewarded in kind; but the reward most usually
forthcoming (according to Mandeville), is praise or flattery, to which
the human mind is acutely sensitive.

(2) Our constitution may be such that we are pained by the sight of an
object in distress, and give assistance, to relieve ourselves of the
pain. This was the view of Hobbes; and it is also admitted by
Mandeville as a secondary motive.

(3) We may be so formed as to derive enjoyment from the performance of
acts of kindness, in the same immediate way that we are gratified by
warmth, flowers, or music; we should thus be moved to benevolence by
an intrinsic pleasure, and not by extraneous consequences.

Bentham speaks of the pleasures and the pains of Benevolence, meaning
that we derive pleasure from causing pleasure to others, and pain from
the sight of pain in others.