During meditation you behold divine visions, experience divine smell, divine taste, divine touch, hear divine Anahata sounds. You receive instructions from God. These indicate that the Kundalini Shakti has been awakened. When there is throbbing in Muladhara, when hairs stand on their roots, when Uddiyana, Jalandhara and Mulabandha come involuntarily, know that Kundalini has awakened.
When the breath stops without any effort, when Kevala Kumbhaka comes by itself without any exertion, know that Kundalini Shakti has become active. When you feel currents of Prana rising up to the Sahasrara, when you experience bliss, when you repeat Om automatically, when there are no thoughts of the world in the mind, know that Kundalini Shakti has awakened.
When, in your meditation, the eyes become fixed on Trikuti, the middle of the eyebrows, when the Shambhavi Mudra operates, know that Kundalini has become active. When you feel vibrations of Prana in different parts inside your body, when you experience jerks like the shocks of electricity, know that Kundalini has become active. During meditation when you feel as if there is no body, when your eyelids become closed and do not open in spite of your exertion, when electric-like currents flow up and down the nerves, know that Kundalini has awakened.
When you meditate, when you get inspiration and insight, when the nature unfolds its secrets to you, all doubts disappear, you understand clearly the meaning of the Vedic texts, know that Kundalini has become active. When your body becomes light like air, when you have a balanced mind in perturbed condition, when you possess inexhaustible energy for work, know that Kundalini has become active.
When you get divine intoxication, when you develop power of oration, know that Kundalini has awakened. When you involuntarily perform different Asanas or poses of Yoga without the least pain or fatigue, know that Kundalini has become active. When you compose beautiful sublime hymns and poetry involuntarily, know that Kundalini has become active.