從水道到心道：習慣如何形成

水道譬喻

“Flowing water hollows out a channel for itself which grows broader and deeper, and when it later flows again, it follows the path traced by itself before. Just so, the impressions of outer objects fashion for themselves more and more appropriate paths in the nervous system, and these vital paths recur under similar external stimulation, even if they have been interrupted for some time.”

—William James （American psychologist）:

"Habit a second nature! Habit is ten times nature."

— Duke of Wellington (as cited in James, Principles of Psychology, 1890)

核心觀念

• 反覆經驗 → 神經通路形成
• 通路會加深、變寬
• 中斷不等於消失
• 相似刺激 → 舊路重現

十八意行的「心路通道」

每次色聲香味觸法觸發時，心就像水流，總順著熟悉的「喜/憂/捨」河道走，形成自動反應。

修行的「渠道重導」

MN137的新渠道，是講毗婆捨那 vipassanā

其它「渠道重導」---以中部（20）《尋之止息經注》為例