What does this sentence mean? What is the purpose of the eyes and the direction of the heart?

1, "What you can see and what you want in your heart will never be forgotten", which means that what you see with your eyes is what you yearn for in your heart.

2. "What you see and what you feel will never be forgotten" is a narrative from Natsume's friend.

This work tells the story of a teenager who can see monsters since he was a child. Since he inherited the "friend account" with the monster's name as proof when his grandmother took the monster as his younger brother, he has been living a life of being hunted by the monster.

4. Later, I met a strange cat teacher who claimed to be a bodyguard. From then on, accompanied by him, I decided to give my name back to Natsume the monster, and began to get in touch with all kinds of monsters and gradually understand their inner thoughts. In the process of meeting and parting with monsters and understanding the memory of good-hearted monsters, Natsume unconsciously got a lot of precious things.