Similarly, we can offer many services with our bodily activities. But all such activities must be in relationship with Kṛṣṇa. This relationship is established by connecting oneself with the bona fide spiritual master, who is the direct representative of Kṛṣṇa in disciplic succession. Therefore, the execution of Kṛṣṇa conscious activities with the body should be directed by the spiritual master and then performed with faith. The connection with the spiritual master is called initiation. From the date of initiation by the spiritual master, the connection between Kṛṣṇa and a person cultivating Kṛṣṇa consciousness is established. Without initiation by a bona fide spiritual master, the actual connection with Kṛṣṇa consciousness is never performed.
This cultivation of Kṛṣṇa consciousness is not material. The Lord has three general energies—namely the external energy, the internal energy and the marginal energy. The living entities are called marginal energy, and the material cosmic manifestation is the action of the external, or material, energy. Then there is the spiritual world, which is a manifestation of the internal energy. The living entities, who are called marginal energy, perform material activities when acting under the inferior, external energy. And when they engage in activities under the internal, spiritual energy, their activities are called Kṛṣṇa conscious. This means that those who are great souls or great devotees do not act under the spell of material energy, but act instead under the protection of the spiritual energy. Any activities done in devotional service, or in Kṛṣṇa consciousness, are directly under the control of spiritual energy. In other words, energy is a sort of strength, and this strength can be spiritualized by the mercy of both the bona fide spiritual master and Kṛṣṇa.