What's the difference between "undisturbed" and "undisturbable" in the following sentence? Thanks!
And anyone who enters the presence of God becomes a partaker of that undisturbed and undisturbable calm.

Question

Answer

undisturbed - is/was not disturbed
undisturbable - can not be disturbed

"undisturbable" isn't a usual english word though.

Answer

'Undisturbed' means: no thing has disturbed it. 
'Undisturbable'' means: no thing can disturb it.