Sócrates dijo a sus amigos: «Algunos de vosotros me habéis dicho: Sócrates, si no se ocupara más que de sus asuntos, seguramente podría escapar a la … - Socrates

Man must rise above the Earth — to the top of the atmosphere and beyond — for only thus will he fully understand the world in which he lives.

When I was young, Cebes, I had a prodigious desire to know the department of philosophy which is called Natural Science; this appeared to me to have lofty aims, as being the science which has to do with the causes of things, and which teaches why a thing is, and is created and destroyed; and I always agitated myself with the consideration of such questions as these... I went on to examine the decay of them, and then to the study of the heaven and earth, and at last I concluded that I was wholly incapable of these inquiries... There was a time when I thought that I understood the meaning of greater and less pretty well... that ten is more than eight, and that two cubits are more than one, because two is twice one. I should be far from imagining... that I knew the cause of any of them, indeed I should, for I cannot satisfy myself that when one is added to one, the one to which the addition is made becomes two... nor can I understand how the division of one is the way to make two; for then a different cause would produce the same effect.

Let a man be of good cheer about his soul, who has cast away the pleasures and ornaments of the body as alien to him, and rather hurtful in their effects, and has followed after the pleasures of knowledge in this life; who has adorned the soul in her own proper jewels, which are temperance, and justice, and courage, and nobility, and truth—in these arrayed she is ready to go on her journey to the world below, when her time comes. You, Simmias and Cebes, and all other men, will depart at some time or other. Me already, as the tragic poet would say, the voice of fate calls.