It is very certain that it is the effect of conversation with the beauty of the soul, to beget a desire and need to impart to others the same knowledge and love. If utterance is denied, the thought lies like a burden on the man. Always the seer is a sayer. Somehow his dream is told: somehow he publishes it with solemn joy: sometimes with pencil on canvas; sometimes with chisel on stone; sometimes in towers and aisles of granite, his soul's worship is builded; sometimes in anthems of indefinite music; but clearest and most permanent, in words.
The man enamored of this excellency, becomes its priest or poet. The office is coeval with the world. But observe the condition, the spiritual limitation of the office. The spirit only can teach. Not any profane man, not any sensual, not any liar, not any slave can teach, but only he can give, who has; he only can create, who is. The man on whom the soul descends, through whom the soul speaks, alone can teach. Courage, piety, love, wisdom, can teach; and every man can open his door to these angels, and they shall bring him the gift of tongues.
From Ralph Waldo Emerson's address delivered before the Senior Class in Divinity College, Cambridge, Sunday evening, July 15, 1838.