How can I keep from singing?

My life goes on in an endless song
Above life's lamentations
I hear that real, though far-off hymn
That hails a new creation

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

While though the tempest loudly roars,
I hear the truth it liveth,
And though the darkness round me close,
Songs in the night it giveth

No storm can shake my inmost calm,
While to that rock I'm clinging
Since love is Lord of heaven and earth
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 are undefiled
How can I keep from singing?