Earlier quoted context omitted.
If you're "ambitious", you may be going where no one has gone before. These days, everyone knows that getting into a land war with Russia is a bad idea, but it may not have always been so. Same thing with lots of other people whose ambition caused them to push the limits (mountain climbers?). If you're at the limits, you may not know when 'determination' means pushing on despite everything to achieve some great succe…
Some people are smart because they push on in the face of great opposition. Others win plaudits for "knowing when to quit" and changing direction. It's all a bit wishy washy, Its not that its wishy washy, its that one of the great keys to success is knowing the difference between the two. On the one hand, if you are on the right track you probably need to be ready to persevere in the face of enormous opposition, but…
Both vary so much between even similar situations, that there is no way of knowing which side of the line cases fall on, unless they are extremely good or bad, except try it and see.