"Leaves die, but trees do not. They only undress".

Henry Ward Beecher (1813 – 1887) was an American Congregationalist clergyman, social reformer, and speaker, known for his support of the abolition of slavery, his emphasis on God's love and a novel oratorical style in which he employed humor, dialect, and slang. He was thought to be the most famous preacher in the nation. Read more

The quote is from his "Proverbs from Plymouth Pulpit" (1887)