The three Gunas, or qualities, of Nature represent a powerful conceptual tool for the seeker to both understand the interplay of the elements of Nature in the world, and to begin to gain leverage on this action in the process of separating oneself from immersion in the action, and eventually gaining mastery over that action. The Gunas permeate the entire world, and through their constant interplay, constitute all forms and forces. The principle of Tamas being inertia, it is considered to be in opposition to Rajas with respect to force, and in opposition to Sattwa with respect to knowledge. The principle of Rajas being kinetic movement, it is considered to be in opposition to the inertial status of Tamas, and the calm and satisfied peaceful energy of Sattwa. The principle of Sattwa is equilibrium, knowledge, harmony and assimilation, and thus, it is in opposition in one respect to the inertia of Tamas and the dissatisfied and striving action of Rajas. We can see easily that Matter has a predominance of the quality of Tamas, Life-Energy of the quality of Rajas and the mind or reasoning intelligence, the quality of Sattwa. At the same time, none of these qualities is ever found in a “pure” state, so there is always both some amount of admixture in all things of the three qualities, despite the predominant mode, and there is always an ever-changing formulation as they mix and interplay with one another. Sri Aurobindo notes: “The whole nature of the embodied living mental being is determined by these three gunas.”
He goes on to describe them at length: “Whatever is predominantly governed by Tamas, tends in its force to a sluggish inaction and immobility or else to a mechanical action which it does not possess, but is possessed by obscure forces which drive it in a mechanical round of energy; equally in its consciousness it turns to an inconscience or enveloped subconscience or to a reluctant, sluggish or in some way mechanical conscious action which does not possess the idea of its own energy, but is guided by an idea which seems external to it or at least concealed from its active awareness.”
“The principle of Rajas has its strongest hold on the vital nature. It is the Life within us that is the strongest kinetic motive power, but the life-power in earthly beings is possessed by the force of desire, therefore Rajas turns always to action and desire; desire is the strongest human and animal initiator of most kinesis and action, predominant to such an extent that many consider it the father of all action and even the originator of our being.”
“The principle of Sattwa has its strongest hold in the mind; not so much in the lower parts of the mind which are dominated by the rajasic life-power, but mostly in the intelligence and the will of the reason. Intelligence, reason, rational will are moved by the nature of their predominant principle towards a constant effort of assimilation, assimilation by knowledge, assimilation by a power of understanding will, a constant effort towards equilibrium, some stability, rule, harmony of the conflicting elements of natural happening and experience.”
Sri Aurobindo, The Synthesis of Yoga, Part Four: The Yoga of Self-Perfection, Chapter 9, The Liberation of the Nature, pg. 657-658