What rules the world is ideas, because ideas define the way reality is perceived.
The world is a tragedy to those who feel, but a comedy to those who think.
(Horace Walpole said)
Nothing great in the world was accomplished without passion.
(Georg Wilhelm Friedrich Hegel said)
The little wisdom that the world possesses, was introduced by lunatics.
(Honoré Gabriel Riqueti said)
Travel makes one modest. You see what a tiny place you occupy in the world.