Do you humm or do you sing? In private and in public?

I'd sing it if I could... well no, will sing anyway. 

"O to grace how great a debtor

Daily I'm constrained to be!

Let Thy goodness like a fetter

Bind my wand'ring heart to Thee:

Prone to wander—Lord, I feel it—

Prone to leave the God I love;

Here's my heart—O take a seal it,

Seal it for Thy courts above." ~ Anon. 

Verbally denyin' that the Lord is there.. just to avoid establishing a two way friendship with Him is kinda like stayin' in a deep frigidly dank cave ..just to eliminate the penetrating warmth of sunshine, even though you really desire the pleasant heat of it coming down on your back. You were designed for worship -- yup, of the Lord and of no one else. Of nothing else.