It is unwise to limit the Dharma to just one language. The Dharma is free from the vanity of language, free from the prejudices of those who are attached to the letter and not to the meaning. For them, the jungle of words becomes a wall. […]
Do not hesitate to teach the Dharma in as many languages as you encounter, that its sound may reach all those who might understand it.
Speak patiently and without hurry, avoid words that common folk do not understand, be diligent and patient. The fancy word is as much an enemy of the Dharma as is vulgarity.