| 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. |
