Account, Narrative
The thread you weave together to tell others about oneself is the account of your life. It's your very own narrative, tying everything you've been through together.
Picture this account of your life, the thread of the narrative linking all of the different important points in your life together.
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You take this account and lock it with a special key (き). You only give this key to people you really trust, so they can read the account of your life and truly understand you.
Picture the people in your life that you'd give this special key to. They'd get to read the account of your life, so make sure they're trustworthy before you hand that key over.