History is the science of people.
Living is nothing more or less than doing one thing instead of another.
One age cannot be completely understood if all the others are not understood. The song of history can only be sung as a whole.
All we are given is possibilities — to make ourselves one thing or another.
The type of human being we prefer reveals the contours of our heart.
The man who discovers a new scientific truth has previously had to smash to atoms almost everything he had learnt, and arrives at the new truth with hands blood stained from the slaughter of a thousand platitudes.