[The career a young man should choose should be] one that is most consonant with our dignity, one that is based on ideas of whose truth we are wholly convinced, one that offers us largest scope in working for humanity and approaching that general goal towards which each profession offers only one of the means: the goal of perfection … If he works only for himself he can become a famous scholar, a great sage, an excellent imaginative writer [Dichter], but never a perfected, a truly great man.

in Karl Marx and World Literature (1976) by S. S. Prawer, p. 2. - Reflections of a Youth on Choosing an Occupation (1835)