Letters 66.24

Now friendship in the case of men corresponds to desirability in the case of things. You would not, I fancy, love a good man if he were rich any more than if he were poor, nor would you love a strong and muscular person more than one who was slender and of delicate constitution. Accordingly, neither will you seek or love a good thing that is mirthful and tranquil more than one that is full of perplexity and toil.

Seneca, Letters to Lucilius 66.24, translated by Richard Mott Gummere