Thầy explore the Seven Factors of Enlightenment, emphasizing that deep insight requires a foundation of relaxation and joy. He introduces the vital practice of the separate investigation of the phenomenal (lakṣaṇa) and noumenal (nature) realms—to clarify the relationship between conventional and ultimate truths. Using this framework, Thầy corrects a common scriptural misunderstanding: he explains that all Four Noble Truths must be understood as conditioned (saṃskṛta) and impermanent within the conventional dimension. However, by looking deeply into these conventional realities—just as a wave touches her true nature as water—we directly encounter the ultimate dimension, which is entirely free from the notions of birth, death, being, and non-being.

Turning to the Second Noble Truth, Thầy explains how suffering arises and persists through the intake of unwholesome food, framing the practice of the Fifth Mindfulness Training around the Buddha’s teaching on the Four Nutriments. Drawing from the Sutra on the Son’s Flesh, he unpacks the four types of nutriment: edible foods, sensory impressions, volition, and collective consciousness. Thầy illustrates the highly toxic nature of unmindful sensory consumption by sharing his advice to an editor at the Times of India on how to report devastating news without watering seeds of despair and anger in society.

Finally, Thầy highlights the urgent need to protect ourselves and future generations from psychological toxins through mindful consumption. He shares the classic story of the mother of Mencius (Meng Zi) to demonstrate the power of choosing a wholesome collective environment. To bring these healing practices into the mainstream, Thầy calls upon educators and writers to help “train the trainers” and adapt the Five Mindfulness Trainings into secular manuals for schools worldwide.

This is the seventh talk in a series of thirteen given during The Science of the Buddha, twenty-one-day retreat in the year 2012. Thay offered this talk at the Upper Hamlet, Plum Village, France.