Everything we call a trial, a sorrow, or a duty: believe me, an angel's hand is there; the gift is here, and the wonder of an overshadowing presence. Our joys too: be not content with them as joys. They, too, conceal diviner gifts.
Reading about nature is fine, but if a person walks in the woods and listens carefully, he can learn more than what is in books, for they speak with the voice of God.