We sail within a vast sphere, ever drifting in uncertainty, driven from end to end.

When I consider the small span of my life absorbed in the eternity of all time, or the small part of space which I can touch or see engulfed by the infinite immensity of spaces that I know not and that know me not, I am frightened and astonished to see myself here instead of there … now instead of then.

Time heals griefs and quarrels, for we change and are no longer the same persons. Neither the offender nor the offended are any more themselves.

Fuller believed human societies would soon rely mainly on renewable sources of energy, such as solar- and wind-derived electricity,. envisioned an age of "universal education and sustenance of all humanity". "The heart has reasons that reason does not understand."

The heart has its reasons, which Reason does not know. We feel it in a thousand things. It is the heart which feels God, and not Reason. This, then, is perfect faith: God felt in the heart.

When a natural discourse paints a passion or an effect, one feels within oneself the truth of what one reads, which was there before, although one did not know it. Hence one is inclined to love him who makes us feel it, for he has not shown us his own riches, but ours. ...such community of intellect that we have with him necessarily inclines the heart to love.

The state of man is inconstancy, ennui, anxiety.

In faith there is enough light for those who want to believe and enough shadows to blind those who don't.

Between us and heaven or hell there is only life, which is the frailest thing in the world.