"Intellectual ''work'' is misnamed; it is a pleasure, a dissipation, and is its own highest reward."

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The first, sickness (vyadhi), is a physical obstacle, but the other eight can be considered mental. These include languor (styana), doubt (samshaya), heedlessness (pramada), sloth (alasya), dissipation (avirati), false vision (bhranti-darshana), nonattainment of yogic states (alabdha-bhumikatva), and instability in these states (anavasthitatva).

— Richard Rosen