# Bhagavad Gita
All Bhagavad Gita notes →Atman (आत्मन्)
The self that inhabits the body in the Gita's second chapter — unborn, imperishable, and untouched by what happens to the body — the metaphysical foundation the chapter's argument for fighting rests on.
Dharma (धर्म)
One's own duty (svadharma) in the Gita's second chapter — a role-bound, contextual obligation, not a single universal rule for everyone.
Karma (कर्म)
The Gita's technical sense of karma — action itself, and the discipline of acting without attachment to its fruit — distinct from the popular "cosmic reward and punishment" meaning of the word.
Sthitaprajna (स्थितप्रज्ञ)
The "person of steady wisdom" the Gita's second chapter closes with — its technical term for what settled equanimity actually looks like, in mind and action.
Yoga (योग)
In the Gita's second chapter, yoga names a discipline of evenness of mind in action — not a physical practice, and not a single technique — first given this technical sense at BG 2.48.
# Philosophy
All Philosophy notes →Sunk Cost Fallacy
Why continuing a doomed course of action because of what's already been spent is irrational, and the marginal-cost reframe that fixes it.
Philosophy
A book-shaped table of contents for philosophy: cognitive biases and decision-making, mental models for systems thinking, and stoic practice — cross-linking existing productivity and system-design notes instead of duplicating them.