What is the best way to develop a strong sense of having something to protect

In HPMOR Eliezer makes “Something to Protect” Harry’s power that the Dark Lord doesn’t have. In Posture for Mental Arts Valentine from CFAR argues that it’s likely a key part of having proper mental posture.

Did any of you make a conscious attempt to develop this sense of having something to protect? If so what worked for you? What didn’t work?

Is there relevant academic research on the topic that’s useful to know?