并列题名：On tranquillity of mind On tranquillity of mind 并列题名：Tranquility & joy 并列题名：Steps to an ecology of mind 并列题名：On the direction of mind 并列题名：State of mind 并列题名：Archaeology of mind 并列题名：Mechanism of mind 并列题名：On brightness of mind 并列题名：Tranquility and noise