The Four Types of Relationships - fs.blog  ## Metadata - Author: **fs.blog** - Full Title: The Four Types of Relationships - Category: #articles - URL: https://fs.blog/four-types-of-relationships/ ## Highlights - The single most important principle in biology is sustainability. In fact, it’s so important, that it means everything. Nothing matters if you can’t pass the test of time. When human relationships are sustainable not only do they survive, they compound.