Three Things by Ella Wheeler Wilcox (1850 - 1919)

Her final words in her autobiography The Worlds and I: "From this mighty storehouse (of God, and the hierarchies of Spiritual Beings) we may gather wisdom and knowledge, and receive light and power, as we pass through this preparatory room of earth, which is only one of the innumerable mansions in our Father's house. Think on these things". - Summary by Wikipedia