In the Caitanya-caritāmṛta (CC Madhya 19.149) it is said:
- kṛṣṇa-bhakta—niṣkāma, ataeva 'śānta'
- bhukti-mukti-siddhi-kāmī—sakali 'aśānta'
The word śānta means completely peaceful. Unless all one's desires are fulfilled, one cannot be peaceful. Everyone is trying to fulfill his aspirations and desires, be they material or spiritual. Those in the material world are aśānta (without peace) because they have so many desires to fulfill. The pure devotee, however, is without desire. Anyābhilāṣitā-śūnya: a pure devotee is completely free from all kinds of material desire. Karmīs, on the other hand, are simply full of desires because they try to enjoy sense gratification. They are not peaceful in this life, nor the next, during the past, present or future. Similarly, jñānīs are always aspiring after liberation and trying to become one with the Supreme. Yogīs are aspiring after many siddhis (powers)—aṇimā, laghimā, prāpti, etc. However, a devotee is not at all interested in these things because he is fully dependent on the mercy of Kṛṣṇa. Kṛṣṇa is yogeśvara, the possessor of all mystic powers (siddhis), and He is ātmārāma, fully self-satisfied. The yoga-siddhis are described in this verse. One can fly in outer space without the aid of a machine, and he can travel at the speed of mind. This means that as soon as a yogī desires to go somewhere within this universe or even beyond this universe, he can do so immediately. One cannot estimate the speed of mind, for within a second the mind can go many millions of miles. Sometimes yogīs enter into the bodies of other people and act as they desire when their bodies are not working properly. When the body becomes old, a perfect yogī can find a young, able body. Giving up his old body, the yogī can enter into the young body and act as he pleases. Being a plenary expansion of Lord Vāsudeva, Lord Ṛṣabhadeva possessed all these mystic yoga powers, but He was satisfied with His devotional love of Kṛṣṇa, which was evinced by the ecstatic symptoms, such as crying, laughing and shivering.