摩訶止觀 3.216

3.216

第八云：「置毒乳中，遍於五味，皆能殺人。」此譬豈不譬於不定？即成四種理、教、行、證，而得入圓。

Chapter Eight says: "If poison is placed in milk, pervading the five flavors, each can kill people." Does this analogy not serve as an analogy for the indeterminate? This then establishes the four kinds—principle, teaching, practice, and realization—by which one gains entry to the perfect.