A mind must have space. 

Space is not only a distance between here and there 

— space implies being without a centre.

If the mind has a centre, and thoughts move away from the centre to the periphery — however far that periphery may be, the mind is still limited.

Space indicates no centre and no periphery, no boundary. 

If the mind is crude, vulgar and self centred, it cannot enjoy measureless space.  

The spacious mind which resides in emptiness holds within itself the possibility for endless creativity to arise …