। ॥
In plain words
The knowers say that liberation is threefold: with form, without form, and of both natures. The destruction of the 'I'-thought that distinguishes these three is liberation in the highest truth.
Word for word
'With form, without form, and of both natures: liberation is threefold', so the knowers say. The destruction of that 'I'-thought which distinguishes this triad is liberation in the highest truth.