> For the complete documentation index, see [llms.txt](https://www.oulan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.oulan.com/2017/11/19.md). # 19 思维产生价值。在波涛中航行，无形的获得比有形的多得多。早安，世界。早安，未来。早安，自在的你。