When we take the Buddha as an authority, as a reliable teacher, we do so on the basis of having investigated and examined his principal teaching- the Four Noble Truths.
Marie de Vichy-Chamrond, marquise du Deffand
If ever I am a teacher, it will be to learn more than to teach.
Sri Ramakrishna Paramahamsa
If they need teaching, then He will be the Teacher. He is our inner Guide.