This quote is telling us that marketing is not as complicated as it might seem. It's essentially about expressing your enthusiasm and excitement for something you care about.
Think of marketing as a way to let others know about something you really love. Just like when you tell your friends about your favorite game or movie because you want them to enjoy it too, marketing is sharing your passion with a wider audience.
When you're passionate about something, it shines through in how you talk about it. That's what marketing is – letting your excitement and genuine interest show, so that others become interested too. It's like spreading a positive feeling about something you believe in.