Science and the Axiom of Cause and Effect

One afternoon in a lecture hall, warm yellow light fell across the rows of stone benches as Thầy Thích Chân Quang was teaching the monastics and lay Buddhists. Suddenly, a question rose from the audience, carrying a hint of challenge: "Venerable Sir, many people say that the law of cause and effect (karmic law) has not been proven by science, so how can we believe in it?"

The teacher smiled gently, his kind eyes moving across each waiting face. His voice was slow and clear: "That is a very good question. First, we need to understand what science is. Science consists of things that are logical, reasonable, and can be proven both theoretically and experimentally. However, everything that science proves must begin with something that cannot be proven — and that is an axiom."

A young monk nodded, but many still had doubts. The teacher continued: "For example, in mathematics, when we begin studying geometry, we must accept certain basic axioms without proof. If we did not accept these axioms, we would not have the system of mathematics we have today. Similarly, Buddhism has a fundamental axiom, which is the law of cause and effect (karmic law). All the teachings, theories, ethics, and logic within the Buddha's teachings (Dharma) rest upon this axiom."

A laywoman stood up, curiosity evident in her eyes: "But if the law of cause and effect (karmic law) is an axiom that cannot be proven, how do we know it is the truth?" The teacher nodded: "Truth here is perceived through intuition, through ethics, through conscience. Our ancestors long ago observed that 'as you sow, so shall you reap,' and that 'goodness meets with goodness.' Though we may not know our past or future lives, through practical observation we can see that no matter how wealthy an evil person may become, their later years are inevitably difficult, and their descendants often decline."

The assembly listened as the atmosphere grew quiet and contemplative. The teacher went on: "The law of cause and effect (karmic law) in Buddhism is not the same as cause and effect in agriculture, physics, or medicine. It is the law of moral retribution, directly connected to the suffering (dukkha) and joy of all sentient beings. When we cause someone pain, that is bad karma which will return to us. Conversely, when we bring joy and happiness to others, we create merit."

Another monk spoke up: "Venerable Sir, so when we meet someone who says 'cause and effect has not been proven,' how should we respond?" The teacher answered slowly: "Say this: 'My friend, science is everything that can be proven, but all of those provable things begin with an axiom that cannot be proven. Our Buddhism is the same — all its ethics, logic, and provable teachings rest upon one axiom: the law of cause and effect (karmic law). That is a universal truth.'"

A moment of silence passed, and then applause rang out. People looked at one another, their eyes bright with faith. From that day on, they could confidently answer any question about spirituality and cause and effect (karmic law) with sound reasoning and wisdom.

The Meaning of the Story

This story helps Buddhists understand how to respond intelligently and reasonably when facing skepticism about the law of cause and effect (karmic law) from science or from those outside the faith. The law of cause and effect (karmic law) is a foundational axiom of the Buddha's teachings (Dharma), just like the axioms in mathematics that science must accept before proving anything else. Science has its limits, while the truth of cause and effect (karmic law) transcends our current ability to prove it, yet it is perceived through intuition, ethics, and practical observation passed down through generations. Mastering this reasoning helps practitioners stand firm on the path of practice and share the Buddha's teachings (Dharma) convincingly.

Compiled from a dharma talk by Venerable Thích Chân Quang