Write Down, Record
What you say to oneself (yourself), you decide to write down. Whether this is in the form of a journal, diary, or blog, you feel the need to record these important thoughts in some way.
Just imagine writing in a diary and saying everything to write aloud to yourself in your head. "Dear me, today I learned a lot of new kanji on WaniKani. It was the best. I love the crabigator sooooo much. Love, me."
き
しる
None
You need to protect what you write down and record for yourself with a key (き). These are your special thoughts and feelings, you don't want anyone else to see! Lock them away with a key!
Picture the key you use to keep what you write down a secret. What does it look like? How does it feel in your hands?