Source

Titanic:
I promise. I will never let go, Jack. I’ll never let go.

In this scene, Kate Winslet in Titanic promises Leonardo DiCaprio (Jack) that she will never forget him as he meets his demise.

Never let go in investing:
Quote: “Value investors should make the same promises to the stocks they hold. The simplest explanation for this is, investing with a longer-term horizon forces investors to become extremely selective and look for really, really, really cheap companies that will earn them superior investment returns for a long time. Better yet, making a good long-term investment means you don’t have to put energy into reinvesting that money, which frees up time to find other undervalued companies. Best of all, an investment isn’t taxed until it’s sold, and long-term capital gains are taxed at a lower rate than short-term gains.”

Star Wars:
Your eyes can deceive you. Don’t trust them.

In this scene, Obi Wan in Star Wars is teaching his apprentice, Luke Skywalker, to ignore his external emotions, such as fear and greed, and trust his inner feelings.

Investors should do the same. Don’t let Mr. Market get the best of you, by tricking you to become emotional.