Letters 64.5

I want something to overcome, something on which I may test my endurance. For this is another remarkable quality that Sextius possesses: he will show you the grandeur of the happy life and yet will not make you despair of attaining it; you will understand that it is on high, but that it is accessible to him who has the will to seek it.

Seneca, Letters to Lucilius 64.5, translated by Richard Mott Gummere