The Buddha taught far fewer things than he knew of. He told his disciples:
"[T]hose things that I have known with direct knowledge but have not taught are far more numerous [than what I have taught]. And why haven't I taught them? Because they are not connected with the goal, do not relate to the rudiments of the holy life, and do not lead to disenchantment, to dispassion, to cessation, to calm, to direct knowledge, to self-awakening, to Unbinding. That is why I have not taught them."
He likened what he did teach to a handful of leaves in the forest, which has inspired forest monk Thanissaro Bhikkhu to name his 4-volume anthology of translations from the Pali Canon just that—A Handful of Leaves (a fifth volume is soon to appear). You can't buy it, but you can have the entire set for free.
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