Sri Aurobindo portrays evolution as a progressive manifestation of consciousness, beginning from apparent Inconscience and moving toward a divine fulfillment. The journey starts with material or physical consciousness, where spirit is immersed in matter and functions largely through subconscious, instinctive processes. From this base, life or vital consciousness emerges, characterized by desire, emotion, impulse, and the will to live, expand, and enjoy, yet still dominated by egoistic drives. With the appearance of mind in the human being, evolution becomes self-aware: rational thought, reflection, and objective knowledge develop, but remain confined within dualistic and conceptual limits.

Beyond this ordinary mentality, Sri Aurobindo describes a graded series of higher mental and spiritual planes that mark the deeper stages of spiritual growth. The Higher Mind brings a more luminous, wide, and ideational seeing of truth; the Illumined Mind shifts the center of knowing from discursive thought to light, vision, and inspiration. The Intuitive Mind gives direct, immediate insight, a spontaneous truth-sense that does not depend on reasoning. Above these stands the Overmind, a cosmic consciousness that can hold multiple truths at once and perceive the One in the many, yet still works through a multiplicity of powers and formations.

The culmination of this ascent is the Supermind or supramental consciousness, which Sri Aurobindo regards as the decisive stage of spiritual evolution. Supermind is described as a Truth-Consciousness that knows by identity, reconciles unity and multiplicity, and possesses the power to transform mind, life, and even the physical consciousness. Its realization does not aim merely at individual liberation but at the emergence of a gnostic being and the possibility of a divine life on earth. In this light, spiritual evolution is not an escape from the world but a progressive divinization of existence itself.

Integral Yoga, as articulated in these writings, speaks also of three great movements of transformation that organize this ascent. Psychic transformation centers on the awakening and emergence of the psychic being, the soul-element behind mind, life, and body, which brings purity, devotion, sincerity, and a sure inner guidance toward the Divine. Spiritual transformation follows, marked by the opening to peace, silence, wideness, cosmic consciousness, and the higher planes up to the Overmind, establishing liberation and a universal spiritual poise. Finally, supramental transformation involves the descent and establishment of the Supermind in the whole nature, effecting a radical change in consciousness that prepares a new type of humanity shaped by truth, unity, and a conscious participation in the divine will.