an.1.47 Aṅguttara Nikāya (Numbered Discourses)

47
“Just as, mendicants, the boxwood is said to be the best kind of tree in terms of its pliability and workability,
so too, I do not see a single thing that’s as pliable and workable as the mind, when it is developed and cultivated.
A mind that is developed and cultivated is pliable and workable.”