Student or Learner
"believe in something/someone" has three meanings such as "the ability or capability of someone", "the value of something", and "the existence of something". Which do you think this refers to? I think the second or the third.
6)They know When the best waves are coming. They can feel it. It's a gift. You have that gift, too. Listen to your [ distinct / instinct ]. [ Believe init.
Listen to your instinct. Believe in it.
I would go with 'the ability or capability of someone'.