These then exit, behold, ‘the masters of stature’ are knocking at the entrance – which is the stature of the body of the King, of which it is stated: (Dan. 10:6) And its body as ‘tarshish’. And it is this which is called ‘heavens’, through which are opened five lights. It is this that is written: (Ez. 1:1)... the heavens opened and I saw visions of ELQYM.
And these five lights are the 5 books of the Torah. Because it the Written Torah is Vav ו (=6). And through it are ‘opened’ the five lights of the letter Hei ה, which add up to ‘the fifty gates of freedom’.