Seneca · On a promising pupil
Letters 34.2
I claim you for myself; you are my handiwork. When I saw your abilities, I laid my hand upon you, I exhorted you, I applied the goad and did not permit you to march lazily, but roused you continually. And now I do the same; but by this time I am cheering on one who is in the race and so in turn cheers me on.
Seneca, Letters to Lucilius 34.2, translated by Richard Mott Gummere