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?