। ॥
In plain words
When the 'I' is, all this appears; when the 'I' dissolves, nothing whatever appears. So all this has the 'I' for its form, and searching for it is the path by which all is conquered.
Word for word
When the 'I' is, all this appears; when the 'I' dissolves, not anything at all appears. Therefore this whole has the 'I' for its form; the search for it is the path to conquering all.