Back to school Zen:

It may take you three minutes, it may take you thirty years. And I mean that.
—Hasegawa, on being asked how long it takes to finish a Lit dissertation to obtain an understanding of Zen

What I know of the divine sciences and of Holy Scripture I learned in woods and fields, by prayer and meditation. I have had no other masters than the beeches and oaks.
—St. Bernard of Clairvaux

The seasons change, the stars shine in the heavens—it's perfect wisdom. Regardless of whether we realize it or not, we are nothing but the Way itself.
—Dōgen

What we cannot speak about we must pass over in silence.
—Ludwing Wittgenstein

In your heart, you already know.
—Zen saying