When automatic repetition of Aum or any other mantra takes place, when different kinds of nada (subtle inner sounds) become audible and the mind experiences waves of blissful beatitude, or you feel a sense of loss of body consciousness or awareness of time, know that the kundalini has come into action.
When with the closing of eyes in meditation your body falls to the ground, or begins to rotate like a grinding stone, or the body squatted on the floor cross-legged begins to jump from place to place like a frog, or lies down like one dead, you feel contraction of nerves, you feel as if your life is passing away, the body undergoes convulsions like a dying fish, know that the kundalini has come into action.
When no sooner you have sat with eyes closed in meditation the body begins to show activity of throwing out limbs forcibly, deformed sounds are loudly uttered, your speech begins to utter sounds like those of animals, birds, frogs, lion or like those of jackals, dogs, tigers, fear inspiring and not pleasing to hear, know that the kundalini has come into action.
As soon as you sit for meditation you begin to sing melodious songs, whose composition takes place involuntarily. You pronounce languages you know not, compose poems or other forms of creative literature, know that the kundalini has come into action.
When you feel intoxicated without taking any drugs, while walking your steps fall like one drunk and you are unable to do any other work and you like to remain mute and dislike speaking to or hearing others and you feel like one drunk of divinity, know that the kundalini, has come into action.
When in meditation you see visions, have divine smells, see divine figures, feel divine tastes, hear divine sounds and experience divine touch and receive instructions from God, then understand that the kundalini has come into action.
When in meditation the hidden meaning of the scriptures become clear, all doubts vanish, you acquire strange powers of oratory and tremendous self-confidence, understand that the kundalini has come into action.
When in meditation glimpses of the past and future is seen, their mystery becomes known, it is a clear sign that the kundalini has come into action.