My first encounter with a grizzly back in the spring of 92' had a profound effect on me. It was at less than 20' away. We were in the boat on the narrow (20' wide) Swanson River. It stared both of us in the eye, stood up on his hind legs, then turned and slipped into the woods. My first thought before he turned and left was "I might die, but at least I got to see a bear." My wife was horrified, (she was even closer being in the bow) and after the initial shock started paddling like a nut. I thought this was going to end her tripping career, but luckily it didn't.
The profound effect was that for the first time in my life I felt true wilderness. I loved the feeling and wanted to seek it out at every opportunity. Up until this point I didn't know where my outdoor pursuits in Ak. would take me. Without this experience I could have set my sights on a combination of chasing salmon on the road system, mountain biking, backpacking and some canoe tripping. But the canoe was the best and easiest way to find wilderness, so that's almost exclusively what I did.
That trip was the last time I went out in bear country unarmed. I always carried bear spray and a 12 gage after that. On solo trips I started leaving the shot gun at home, taking just the bear spray and a sidearm until I stupidly sold it. After that I would take two bear sprays, one on my belt and one on my pack.
Bears are something we have to live with when out in the woods. Just about every night before bed the thought that I could die that night would go through my head. It was a lot stronger in the early days then it is now, and that was before I met my good friend Helmuth Port, who was attacked in his tent. I think the reason I don't dwell on it as much now is that being older I don't have as much to loose.
As for boxing with a bear, Gene Moe, my first employer after joining the cement masons union had to box a grizzly with a knife in one hand. a It jumped on him when field dressing a deer. He killed it, but suffered severe injuries in the process and was lucky to survive. You can probably google it to read the account.