Andrzej Sapkowski said this quote
“ Why didn't you become a sorcerer, Geralt? Weren't you ever attracted by the Art? Be honest.''I will. I was.''Why, then, didn't you follow the voice of that attraction?''I decided it would be wiser to follow the voice of good sense.''Meaning?''Years of practice in the witcher's trade have taught me not to bite off more than I can chew. Do you know, Vilgefortz, I once knew a dwarf, who, as a child, dreamed of being an elf. What do you think; would he have become one had he followed the voice of attraction? ”