Consciousness is a born hermit. - George Santayana

In the passion of love, for instance, a cause unknown to the
sufferer, but which is doubtless the spring-flood of hereditary
instincts accidentally let loose, suddenly checks the young
man's gayety, dispels his random curiosity, arrests perhaps his very breath; and when he looks for a cause to explain his
suspended faculties, he can find it only in the presence or image of another being, of whose character, possibly, he knows nothing and whose beauty may not be remarkable; yet
that image pursues him everywhere, and he is dominated by
an unaccustomed tragic earnestness and a new capacity for
suffering and joy.
If the passion be strong there is no previous interest or duty that
will be remembered before it; if it be lasting the whole life may
be reorganized by it, it may impose new habits, other manners,
and another religion.
Yet what is the root of all this idealism? An irrational instinct,
normally intermittent, such as all dumb creatures share, which
has here managed to dominate a human soul and to enlist all the
mental powers in its more or less permanent service, upsetting
their usual equilibrium.
This madness, however, inspires method; and for the first time,
perhaps, in his life, the man has something to live for.

Happiness is the only sanction of life; where happiness fails, existence remains a mad and lamentable experiment.

We study the past as a dead object, as a ruin, not as an authority and as an experiment. One reason why history was less interesting to former ages was that they were less conscious of separation from the past. The perspective of time was less clear because the synthesis of experience was more complete. The mind does not easily discriminate the successive phases of an action in which it is still engaged; it does not arrange in a temporal series the elements of a single perception, but posits them all together as constituting a permanent and real object. Human nature and the life of the world were real and stable objects to the apprehension of our forefathers; the actors changed, but not the characters or the play. Men were then less studious of derivations because they were more conscious of identities.