- A generation stage where the primary concern is with the visualisation of oneself as a deity within the context of a mandala.
- A completion stage where the primary concern is with the purification of one’s winds and drops within the central channel, a process that culminates in the attainment of Buddhahood.
Regarding the outer or external aspect of conventional reality, the wheel of time refers to the passage of days, months, and years (as well as the cycles of the zodiac), while with regard to the individual or inner aspect, it refers to "the circulation of pranas [vital airs] within the wheel of the nadis [subtle channels] in the body," which is linked with the 12 aspects of dependent origination and the 12 signs of the zodiac. These different cycles are interconnected and correspond to each other.
In the first chapter, it is stated that the world emerges from emptiness and the force of time, which is a kind of power that originates the universe.
Because of time (kalat), from the voids (sunyesu), originate wind, fire, water, and the earth; the continents, mountains, and oceans; the constellations, the sun, the moon, the host of star-planets, and the sages; gods, bhutas, and nagas; animals that have four types of birthplace; humans and hell beings also, on the manifold earth and below; originate in the middle of the void (sunyamadhye), like salt in water, and the egg-born in the middle of an egg.
The nonduality of two facets of a single reality—namely, wisdom (prajña), or emptiness (sunyata), and method (upaya), or compassion (karuna). The word "time" refers to the gnosis of imperishable bliss (aksara-sukha-jñana), which is called a method consisting of compassion, and the word "wheel" designates wisdom consisting of emptiness. Their unity is the Buddha Kalacakra
Adi Buddha (the primaeval Buddha) The original Buddha Buddhist. The primordial force in the cosmos from whom the five Dhyani Buddhas arose. The embodiment of the concept of emptiness. He is considered by some authorities to be identical with Vaharaja and Vajrasattva. His image, sitting on a lotus leaf, is often carried by other Buddhist deities.
The Kalacakratantra summarises its fundamental doctrines in the following passage:
Identitylessness, the maturation of karma, the three realms, the six states of existence, the origination due to the twelve-limbed dependence, the Four Truths, the eighteen unique qualities of the Buddha, the five psycho-physical aggregates, the three bodies, the Sahajakaya, and animate emptiness. The system in which these are taught is the clear and definite instruction of the Vajri.