Sri Caitanya Mahaprabhu exhibited His mystic power in presenting Himself simultaneously in each and every sankirtana group. Most people thought that He was one, but some saw that He was many. The internal devotees could understand that the Lord, although one, was exhibiting Himself as many in the different sankirtana groups. When Sri Caitanya Mahaprabhu danced, He forgot Himself and was simply absorbed in ecstatic bliss. However, His internal potency arranged everything perfectly. This is the difference between the internal and external potency. In the material world, the external potency (material energy) can act only after one endeavors at great length, but when the Supreme Lord desires, everything is performed automatically by the internal potency. By His will, things happen so nicely and perfectly that they appear to be carried out automatically. Sometimes the activities of the internal potency are exhibited in the material world. In fact, all the activities of material nature are actually performed by the inconceivable energies of the Lord, but so-called scientists and students of material nature are unable to understand ultimately how things are happening. They evasively conclude that everything is being done by nature, but they do not know that behind nature is the potent Supreme Personality of Godhead. This is explained in Bhagavad-gita: