People 20 Life Lessons from the 1900s Still Relevant Today C.C. 0 © Public Domain/ Wikimedia Commons Learn from the past One of the most-quoted phrases of the 20th century was by essayist and philosopher George Santayana: “Those who cannot remember the past are condemned to repeat it.” Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 <1 ... 78 9 1011 ... 21>