an.3.44 Aṅguttara Nikāya (Numbered Discourses)

“Bhikkhus, in three cases talk flows smoothly. What three? (1) When the one who teaches the Dhamma experiences the meaning and the Dhamma. (2) When the one who hears the Dhamma experiences the meaning and the Dhamma. (3) When both the one who teaches the Dhamma and the one who hears the Dhamma experience the meaning and the Dhamma. In these three cases talk flows smoothly.”