saktyavastha-pravistasya nirvibhagena bhavana I tadasu sivarupi syat saivi-mukham ihocyate II "when one who enters the state of Energy realizes the non-distinction (from it), then he becomes one with Shiva. Shakti (energy) is called the entrance (leading) to Shiva." V.B.T - 20 (commentaries by Swami Lakshman Joo)