Henri Bergson opens his inquiry by examining the fundamental limits of the human intellect, arguing that our cognitive faculties are naturally shaped to navigate and manipulate inert matter rather than comprehend the living flow of reality. Instead of accepting the mechanistic assumption that the future and past are merely calculable functions of the present, or the teleological view that everything is predetermined by a fixed plan, the author posits that existence is a ceaseless creation of the new.
The core of the argument centers on duration, described as a continuous, irreversible progress in which the past constantly gnaws into the future. Life is not a static arrangement of parts but an indivisible current of energy that divides and evolves along divergent paths. Through an exploration of the organic world, the text demonstrates how vital impulses manifest differently across species, leading to divergent paths of evolution.
A central distinction is drawn between intelligence and instinct as two fundamentally different, yet complementary, modes of psychical activity. While intelligence excels in manufacturing tools and operating within the realm of unorganized solids, it inherently struggles to grasp true continuity and mobility. Instinct, on the other hand, remains deeply attuned to the organic rhythm of life itself, acting intuitively where intellect must analyze and divide.
The work further analyzes the historical trajectory of life, noting how various organisms encounter obstacles like physical armor or vegetative torpor, which often lead to evolutionary blind alleys. Among these, the lines leading to arthropods and vertebrates represent the highest achievements in mobility and consciousness, culminating respectively in insect instinct and human intelligence.
Throughout the text, Bergson critiques contemporary evolutionary theories—including Darwinism, neo-Darwinism, and neo-Lamarckism—for relying on frameworks that reduce vital creation to mere mechanical adaptation or random accumulation. He suggests that true evolution requires recognizing an original internal impetus shared across living forms, uniting them through underlying tendencies despite their divergence.
Ultimately, the essay invites readers to transcend the rigid habits of intellectual thought by tapping into the vague intuitive fringe that surrounds distinct conceptual reasoning. By embracing a philosophy that aligns with the fluid, creative momentum of existence, one can catch a fleeting yet profound glimpse of life as an ongoing, unconstrained act of generation.