I'd read Sun Tzu's The Art of War many years ago but don't remember much from it now. Only something that resembles the old sports saying "a good offense is a good defense."
The author of the The War of Art, Steven Pressfield, has left a much stronger impression. He pulls no punches when he talks about what sets amateurs and professionals apart from each other and the role Resistance plays in keeping people in one camp or the other.
Whether you're an artist or just trying to find your path, here are a few items from Pressfield's list of what he terms Resistance's Greatest Hits - the activities that most commonly elicit Resistance:
1) The pursuit of any calling in writing, painting, music, film, dance, or any creative art, however marginal or unconventional.
2) The launching of any entrepreneurial venture.
3) The undertaking of any enterprise or endeavor whose aim is to help others.
There are eight more items on the list that include everything from physical to spiritual to mental improvement. So you don't have to be an aspiring artist - amateur or professional - to appreciate the insights this book offers. I won't give away the difference between the two. But take my word for it, if you think you're a professional at whatever it is you're doing now, chances are you're not. Most of us have a lot of work to do to get there.