The passage quoted in this episode is taken from Seneca’s Consolation to Helvia.
“For how little have we lost, when the two finest things of all will accompany us wherever we go, universal nature and our individual virtue. Believe me, this was the intention of whoever formed the universe, whether all-powerful God, or incorporeal reason creating mighty works, or Divine spirit penetrating all things from greatest to smallest with even pressure, or fate and the unchanging sequence of causation – this, I say, was the intention, that only the most worthless of our possessions should come into the power of another. Whatever is best for a human being lies outside human control: it can neither be given nor taken away. The world you see, natures greatest and most glorious creation, and the human mind which gases and wonders at it, and is the most splendid part of it, these are our own everlasting possessions and will remain with us as long as we ourselves remain. So, eager and upright, let us hasten with bold steps wherever circumstances take us, and let us journey through any countries whatever: there can be no place of exile within the world since nothing within the world is alien to men. From whatever point on the earth surface you look up to heaven the same distance lies between the realms of gods and men. Accordingly, provided my eyes are not withdrawn from that spectacle, of which they never tire, provided I may look upon the sun and the moon and gaze at the other planets; provided I may trace their risings and settings, their periods and the causes of their travelling faster or slower; provided I may behold all the stars that shine at night – some fixed, others not travelling far afield but circling within the same area; some suddenly shooting forth, and others dazzling the eye with scattered fire, as if they are falling, or gliding past with a long trail of blazing light; provided I can commune with these and, so far as humans may, associate with the divine, and provided I can keep my mind always directed upwards, striving for a vision of kindred things – what does it matter what ground I stand on?” – Seneca, On the Shortness of Life