George Santayana was a man who lived a long time ago and was really smart. He was born in Spain but moved to America when he was a grown-up. He liked to think about big ideas like philosophy and religion. He wrote a lot of books and people still read them today.
One thing that George Santayana is famous for saying is, "Those who cannot remember the past are condemned to repeat it." This means that if you don't learn from the mistakes that people have made in the past, you might make the same mistakes again.
It's like when you touch something hot and it burns you. If you remember that it hurt, you won't touch that thing again. But if you forget and touch it again, you'll get burned again.
George Santayana believed that it was really important to learn from history so that we don't make the same mistakes over and over again. This is why people still talk about him and read his books today.