15. hridaye cittasamghattad drisyasvapadarsanam //

When his thoughts are diverted to the center of God consciousness, then he feels the existence of God consciousness in oneness in the objective world and in the world of negation.
The literal reading is "When all one's thoughts are diverted to the heart." Here the word heart (hridaye) does not mean our own physical heart. Rather, here the word "heart" means the light of consciousness (cit prakasa) which is the background, the basis, of the existence of the whole universe. On that basis, everything in this universe is moving, being born, dying, suffering, enjoying, smiling, laughing, marrying, etc. Everything has that center of God consciousness as its basis.

This yogi experiences the oneness of the existence of God consciousness in the objective world and in the world of negation. When does the experience of the negation of the objective world occur? The experience of the negation of the objective world takes place at the time of death and at the time of deep sleep. And, in these states also, the yogi effortlessly experiences the existence of God consciousness. How? The yogi accomplishes this by collecting his mind and putting it on that point. Although the mind is always flickering and does not exist in one point, through the practice (sadhana) of one-pointedness, it becomes easy for the yogi to maintain one point. He then discards the differentiation of objectivity and subjectivity and perceives the objective world, which consists not only of external objects but also of his body of wakefulness, his body of the dreaming state, and his body of the dreamless stat e (nila-deha-pranabuddhyatmanah), and the negation of these, which is the void state (Sunya), in its real way as the limbs of his universal body. When you make your mind enter into the light of consciousness then your mind feels this whole universe as one with that universal being.

This is said in Vijnana Bhairava:

O Parvati!, the one who, with one-pointedness, directs all his organs including his mind in the voidness of that heart, which is the light of consciousness, and remains in between the two lotuses of this-ness and I-ness, becomes glorified with God consciousness.
(Vijnana Bhairava 49)

By using the word "glory," this verse indicates that he becomes the ruler of everything that exists. In Svacchanda Tantra, such a yogi is defined as follows:

Such a yogi, situated as one with this whole universe, pervades it. Because he pervades everything which exists, all classes of beings in elements, in the organic world, in animate and inanimate objects, his consciousness is not called God consciousness but rather his God consciousness is transformed into Universal consciousness. (Svacchanda Tantra 4.310)

In the Spanda Karika, it is concluded in this verse:

Do not try to dwell in each and every being. Reside in your own self. When you reside in your self, you will reside in this whole universe because your real self is one with the universe. (Spanda Karika 3.7)
If you reside and are established in the existence of self, you will already be established in the universal self.

~ Shiva Sutras, The Supreme Awakening