One student asked: which is better, the five precepts or the eight precepts, and how do they actually differ?

The Tools Within Us: Precepts, Concentration, and Wisdom Must Be Studied Before They Can Be Used

The teacher explained that within us, inside the sphere of the Dhamma, are tools: the sphere of precepts, the sphere of concentration, the sphere of wisdom, and the sphere of liberation together with the vision of liberation. The first three spheres — precepts, concentration, wisdom — must be studied, exactly as the scriptures record: any son or daughter of a good family who enters the Tathagata's teaching should train in the precept training, the concentration training, and the wisdom training. Once studied, we can put these tools to real use, gaining real benefit from them. The sphere of liberation and the vision of liberation are the tools that accomplish actual freedom; once we've made use of the first three, these two take over — liberation frees us from the unwholesome, while the vision of liberation brings us into a better life, once we've followed what wholesomeness has guided us through in precepts, concentration, and wisdom.

The Five Precepts Protect Us From the Unwholesome; the Eight Protect Us From Both the Unwholesome and the Neutral

Precepts are the tool that creates safety for both ourselves and others, helping keep the world safe. This affects the mental factors of moral shame and moral dread — the sense of shame and fear of wrongdoing — two mental factors that arise together with wholesomeness and are used to draw in the energy of merit. When we keep precepts, these two mental factors grow bright and draw merit in. The five precepts have the quality of protecting whoever keeps them from the unwholesome; the eight precepts protect whoever keeps them from the power of both the unwholesome and the neutral. This is the key difference. If we only want freedom from the unwholesome, the five precepts are sufficient.

The Five Precepts: Providing Safety to People and Beings in Five Domains

Once we undertake the precepts, we must set an intention to provide safety to people and all beings — through not harming or taking life, protecting against harming others' property, protecting others' families from being violated, protecting against wrong speech, and protecting mindfulness itself as the seat of wholesome states. This adds up to protection across five domains. Once we undertake the precepts with the intention to provide protection in all five, the sphere of precepts draws merit in and grows bright. Once bright, it refines our mind continuously, purifying and liberating it layer by layer, storing it in an increasingly subtle dimension according to how sincerely we intend to provide that protection and how purely we aim for purity of heart. The more pure our intention, the more pure the merit becomes. That purity begins as a point of light the size of a needle's tip at our center, then gradually expands until it fills the whole body as a clear sphere.

The Eight Precepts: A More Concentrated Flow of Merit, Because They Free Us From Both the Unwholesome and the Neutral

The eight precepts protect us from both the unwholesome and the neutral, so the merit flowing in through them is more concentrated and brighter still. They require greater determination, since freedom is sought from both the unwholesome and the neutral, not the unwholesome alone. The merit that flows in is therefore purer, carrying us into an even deeper, more subtle inner dimension — reaching a point that even the unwholesome and the neutral cannot touch. This is exactly why we've heard it said that monks who practice rightly and well practice so as to move ever further from defilement and every cause of gloom: the spheres of precepts, concentration, and wisdom refine us clean and pure, from one dimension into a subtler one, liberating us sphere by sphere, dimension by dimension, storing us deep within, far from the defilements that would otherwise reach in and control us.