This all-pervasiveness of Kṛṣṇa is explained in the Bhagavad-gītā, in both the Ninth and Seventh chapters. In the Ninth Chapter Kṛṣṇa is described as all-pervasive in His impersonal feature; everything rests in Him, but He is not personally present everywhere. And in the Seventh Chapter it is stated that the five gross elements (earth, water, fire, air and sky) and the three subtle elements (mind, intelligence and ego) are all His inferior energies. But there is another, superior energy, which is called the living entity. The living entities are also directly part and parcel of Kṛṣṇa. Therefore Kṛṣṇa is both the material and the efficient cause of everything. He is always intermingled with everything as cause and effect. Not only the gopīs but all living entities are always inseparably connected with Kṛṣṇa in all circumstances. The gopīs, however, are perfectly and thoroughly in cognition of this relationship with Kṛṣṇa, whereas the living entities under the spell of māyā, the illusory energy, are forgetful of Kṛṣṇa and think themselves separate identities having no connection with Him.
Love of Kṛṣṇa, or Kṛṣṇa consciousness, is therefore the perfection of real knowledge in understanding things as they are. Our minds can never be vacant. The mind is constantly occupied with some kind of thought, and the subject matter of such thought cannot be outside the eight elements of Kṛṣṇa's energy. One who knows this philosophical aspect of all thoughts is actually a wise man, and he surrenders unto Kṛṣṇa. The gopīs are the epitome of this perfectional stage of knowledge. They are not simple mental speculators. Their minds are always in Kṛṣṇa. The mind is nothing but the energy of Kṛṣṇa. Actually, any person who can think, feel and will cannot be separated from Kṛṣṇa. But the stage in which he can understand his eternal relationship with Kṛṣṇa is called Kṛṣṇa consciousness. The diseased condition in which he cannot understand his eternal relationship with Kṛṣṇa is the contaminated stage, or māyā. Since the gopīs are on the platform of pure transcendental knowledge, their minds are always filled with Kṛṣṇa consciousness. For example, as there is no separation between fire and air, there is no separation between Kṛṣṇa and the living entities. When the living entities forget Kṛṣṇa, they are not in their normal condition. As for the gopīs, because they are always thinking of Kṛṣṇa, they are on the absolute stage of perfection in knowledge. The so-called empiric philosophers sometimes think that the path of bhakti is meant for the less intelligent, but unless the so-called man of knowledge comes to the platform of bhakti, his knowledge is certainly impure and imperfect. Actually, the stage of forgetfulness of our eternal relationship with Kṛṣṇa is separation. But that is also illusory because there is no such separation. The gopīs were not situated in that illusory condition of life, so even from the philosophical point of view, for them there was no separation.