[306] Furthermore, Sandaka, here a certain teacher is a reasoner (takkī), an inquirer (vīmaṃsī). He teaches a Dhamma hammered out by reasoning, following his own line of inquiry, according to his own inspiration. Now, Sandaka, when a teacher is a reasoner, an inquirer, some of it is well reasoned and some is poorly reasoned; some is true and some is otherwise.
In that case, Sandaka, a sensible person reflects thus: 'This worthy teacher is a reasoner, an inquirer. He teaches a Dhamma hammered out by reasoning, following his own line of inquiry, according to his own inspiration. Now when a teacher is a reasoner, an inquirer, some of it is well reasoned and some is poorly reasoned; some is true and some is otherwise.' Having understood, 'This spiritual life (brahmacariya) is without consolation (anassāsika),' he becomes disenchanted and departs from that spiritual life.
This, Sandaka, is the third spiritual life without consolation declared by that Blessed One who knows and sees, the Arahant, the Fully Self-Awakened One — one in which a sensible person would, so far as he is able, not live the spiritual life, and if he did live it, he would not accomplish the true way, the wholesome Dhamma (ñāyaṃ dhammaṃ kusalaṃ).
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.