< I don't relish the thought of studying philosophy anymore. >
It's fine.
<didn't find any definition about it, just texts containing it>
That's the point! Study the texts that contain
successful at and the texts that contain
successful in.
What differences do you find concerning the words that follow?
Any differences? Or is everything the same? If the same
kinds of expressions follow both versions, then there isn't much
difference. It takes a lot of time to do this; that's why I
mentioned that you might not relish the thought of doing it!
To continue using
successful in is just a strategy, of course, but it will work until you learn the truth!
CJ