How to define Systems Thinking. A concept definition vs defining a way of understanding

Not long time ago I came to the idea that, if I want to understand what Systems Thinking is about, a definition is not enough. And because I am here in the land of thinking about systems, a definition of Systems Thinking may put this concept in its epistemological place, among the other sciences and theories, but it does not provide me with speculative tools to gain a critical understanding of Systems Thinking.