In "Disney Jr.'s Ariel" episode "Fernie's Notebook", Ariel sings to encourage Fernie to be confident in his own knowledge. The version in the episode is slightly shorter than the one in the album.
Ariel:
You can trust in what you know
You just gotta try
It comes with you wherever you go
It's always inside you
Chorus:
Yeah, yeah
Ariel:
You know all the facts, front to the back
Everything in that book
Chorus:
You know it
Ariel:
No need to get scared, you know you're prepared
You don't even have to look
You know about the squid
Flounder:
And the jellyfish
Lucia:
And the angelfish
Flounder:
Like me
Ariel:
You got everything that you need
To be everything you can be
Ariel & chorus:
Oh
You can trust in what you know
Oh
When it's time to let it show
Just let it flow-oh-oh-oh
Give it a go-oh-oh-oh
Trust in what you know
Ariel:
There's no need to second guess
What you've always known
Lucia:
You've got this
Ariel:
Keep doing what you do best
Shining on your own, yeah
Chorus:
Yeah, yeah
Ariel & chorus:
Oh
You can trust in what you know
Oh
When it's time to let it show
Just let it flow-oh-oh-oh
Give it a go-oh-oh-oh
Trust in what you know
Fernie:
Fire fish move fast
Clownfish move slow
No more looking back
I can trust in what I know
Ariel & chorus:
Oh
You can trust in what you know
Fernie:
I'll trust in what I know
Ariel & chorus:
Oh
When it's time to let it show
Fernie:
It's time for me to show
Ariel & chorus:
Just let it flow-oh-oh-oh
Give it a go-oh-oh-oh
Fernie:
I'll trust in what I know
Ariel & chorus:
Trust in what you know
Fernie:
I'll trust in what I know