What is the central idea or theme of the essay by the author of Mingsha Mountain?

The author writes about the magnificence of Mingsha Mountain and the quiet beauty of Crescent Spring, not simply to describe the scenery, but to express his life philosophy and sentiment when visiting Mingsha Mountain and Crescent Spring:

He praised the spirit of struggle, perseverance and courage to climb. The peak of life is in unremitting struggle. The final result is not important, but the process of struggle.

He said that life is really hard. You can't find it without going to the peak, and you can't get close to it if you go to the peak. It seems destined to keep going downhill and uphill.