What does the song ocean from hill song mean?

You call me out upon the waters

The great unknown where feet may fail

And there I find You in the mystery

In oceans deep

My faith will standAnd I will call upon Your name

And keep my eyes above the waves

When oceans rise

My soul will rest in Your embrace

For I am Yours and You are mineYour grace abounds in deepest waters

Your sovereign hand

Will be my guide

Where feet may fail and fear surrounds me

You've never failed and You won't start nowSo I will call upon Your name

And keep my eyes above the waves

When oceans rise

My soul will rest in Your embrace

For I am Yours and You are mineSpirit lead me where my trust is without borders

Let me walk upon the waters

Wherever You would call me

Take me deeper than my feet could ever wander

And my faith will be made stronger

In the presence of my Savior ...

The main idea of the song is about stepping out in faith and trusting and really depending on God more than what you usually do.