Here he is delivering a 'Thanksgiving Sermon'. This is a cut-down version; the full sermon can be read here.
A THANKSGIVING SERMON.
MANY ages ago our fathers were living in dens and caves. Their bodies, their low foreheads, were covered with hair. They were eating berries, roots, bark and vermin. They were fond of snakes and raw fish. They discovered fire and, probably by accident, learned how to cause it by friction. They found how to warm themselve — to fight the frost and storm. They fashioned clubs and rude weapons of stone with which they killed the larger beasts and now and then each other. Slowly, painfully, almost imperceptibly they advanced. They crawled and stumbled, staggered and struggled toward the light. To them the world was unknown. On every hand was the mysterious, the sinister, the hurtful. The forests were filled with monsters, and the darkness was crowded with ghosts, devils, and fiendish gods.
These poor wretches were the slaves of fear, the sport of dreams.