How Can i Keep From Singing?

How can I keep from singing?

My life goes on in endless song
Above earth’s lamentations
I hear the real, though far-off hymn
That hails a new creation.

Through all the tumult and the strife
I hear its music ringing,
It sounds an echo in my soul.
How can I keep from singing?

When tyrants tremble in their fear
And hear their death knell ringing,
When friends rejoice both far and near
How can I keep from singing?

In prison cell and dungeon vile
Our thoughts to them are winging,
When friends by shame and undefiled
How can I keep from singing?