Courage is the art of being the only one who knows you're scared to death.
Courage and perseverance have a magical talisman, before which difficulties disappear and obstacles vanish into air.
The true method of knowledge is experiment.
As our circle of knowledge expands, so does the circumference of darkness surrounding it.
No evil propensity of the human heart is so powerful that it may not be subdued by discipline.
One sees great things from the valley; only small things from the peak.
If we do not plant knowledge when young, it will give us no shade when we are old.
Luck is not something you can mention in the presence of self-made men.
The great thing in the world is not so much where we stand, as in what direction we are moving.
The pleasures of ignorance are as great, in their way, as the pleasures of knowledge.
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