Krishna can be in constant companionship with us because He is omnipotent. Therefore, He can be fully in touch with us by His words. His words and He are not different. That is omnipotence. Omnipotence means that everything relating to Him has the same potency.
For example, here in this material world, if we are thirsty and we want water, simply repeating “Water, water, water, water,” will not satisfy our thirst, because this word has not the same potency as water itself. We require the water in substance. Then our thirst will be satisfied. But in the transcendental, absolute world, there is no such difference. Krishna’s name, Krishna’s quality, Krishna’s word—everything is Krishna and provides the same satisfaction.
Some people argue that Arjuna was talking with Krishna because Krishna was present before him, whereas in my case, Krishna is not present. So how can I get directions? But that is not a fact. Krishna is present by His words—the Bhagavad-gita. In India, when we speak on the Bhagavad-gita or Srimad-Bhagavatam, we regularly perform worship with flowers, or with other paraphernalia, as is required for worshiping. In the Sikh religion also, although they have no form of the Deity, they worship the book Granthasahib. Perhaps some of you are acquainted with this Sikh community. They worship this Grantha. Similarly, the Moslems worship the Koran. Similarly, in the Christian world, the Bible is worshiped. It is a fact that the Lord Jesus Christ is present by His words. Krishna is also present by His words.
These personalities, either God or the son of God, who come from the transcendental world, keep their transcendental identities without being contaminated by the material world. That is their omnipotence. We are in the habit of saying that God is omnipotent. Omnipotence means that He is not different from His name, from His quality, from His pastimes, from His instruction. Therefore, the discussion of Bhagavad-gita is as good as discussion with Krishna Himself.
Krishna is seated in your heart, and in my heart too. Ishvara sarva-bhutanam hrd deshe ‘rjuna tishthati [Bhagavad-gita. 18.61]. God is situated in everyone’s heart. God is not away from us. He is present. He is so friendly that He remains with us in our repeated change of births. He is waiting to see when we shall turn to Him. He is so kind that though we may forget Him, He never forgets us. Although a son may forget his father, a father never forgets his son. Similarly, God, the original father of everything, everybody, all living entities, will never forsake us.
Ref: Krishna, the Reservoir of Pleasure authored by Srila Prabhupada (Founder – Acharya, ISKCON)