In the lover stage, there are all other elements. When you love somebody, then there is loving element, and there is paternal element, there is friendship element, there is master and servant element, and there is greatness element. Therefore, in the sense of loving God, all other elements are full. Therefore the full attachment for Kṛṣṇa is to love Him as your lover.
So Kṛṣṇa says mad-āśrayam. This yoga system, bhakti-yoga, is to develop attachment for Kṛṣṇa under His protection. Mad-āśrayaḥ. Just like a friend protects his friend, a master protects his servant, a parent . . . a father protects his child or a lover protects his lover, similarly, there is some protectional element. Mad-āśrayaḥ: "Kṛṣṇa is my friend, He'll protect me." "Kṛṣṇa is my master, He'll protect me." "Kṛṣṇa is my son, He'll protect me." "Kṛṣṇa is my lover, He'll protect me."
So this, this is called mad-āśrayaḥ. If we take this attitude in either of these attitudes, either friend or lover or son or master, like that, and you develop your attachment for Kṛṣṇa, then asaṁśayam, without any doubt, samagram, in complete . . . in full completeness, you can understand what is God.
This is the philosophy of Kṛṣṇa consciousness, that you have to take shelter of Kṛṣṇa in either of these aspects, and you have to develop your attachment for either of these aspect. Then Kṛṣṇa says that jṣānaṁ te 'haṁ sa-vijṣānam idaṁ vakṣyāmy aśeṣataḥ (BG 7.2). Now this knowledge of God is not a sentiment, it is science. It is science. This is scientific. Nobody can deny it. We are not preaching any particular type of sentiment, or any frog's speculation. It is fact. How our relationship with the Supreme Lord can develop, how we are related with Him, these things are fact on philosophical basis.
Therefore Kṛṣṇa is assuring Arjuna that, "What I'm talking to you is not a religious sentiment, but it is jṣānam." Jṣānam means it is practical knowledge. Jṣānam. Jṣānam means theoretical knowledge, and vijṣānam means practical knowledge. So Kṛṣṇa says, jṣānam. Jṣānaṁ te 'haṁ sa-vijṣānam (BG 7.2): "I am just speaking to you the exact knowledge of the Supreme Personality of Godhead with practical demonstration."
Just like in the laboratory, if you are BSc. student, you have to appear for practical examination. Simply knowing that such and such chemical element mixed with such and such chemical element becomes such and such chemical element is theoretical knowledge. Oxygen and hydrogen mixed together produces water. This is theoretical knowledge. But when in the laboratory you actually act—such and such quantity of oxygen gas you mix with such and such quantity of hydrogen gas—at once there is the formulation of water.