Safire, William (1929-2009)
Sagan, Carl (1934-1996)
Sahl, Mort (1927-2021)
Salinger, J. D. (1919-2010)
Sand, George (1804-1876)
Santayana, George (1863-1952)
Saotome, Mitsugu (1926-2008)
Sarnoff, David (1891-1971)
Sartre, Jean Paul (1905-1980)
Schleiermacher, Friedrich (1768-1834)
Schlesinger, Jr. Arthur M. (1917-2007)
Schopenhauer, Arthur (1788-1860)
Schultz, Charles (1922-2000)
Schumacher, E. F. (1911-1977)
Schweitzer, Albert (1874-1965)
Scott, Howard
Scottish saying
Seabury, David (1885-1960)
Seuss, Dr. (1904-1991)
Shakes, Ronnie (1947-1987)
Shakespeare, William (1564-1616)
Shaw, George Bernard (1856-1950)
Shiller, Robert J. (1946-)
Shinn, Florence Scovel (1871-1940)
Shinseki, Eric, Chief of Staff, U.S. Army (1942-)
Sibelius, Jean (1865-1957)
Sihanouk, Norodom, Prince of Cambodia (1922-2012)
Simon, Herbert (1916-2001)
Sinclair, Upton (1878-1968)
Smith, Logan Pearsall (1865-1946)
Sockman, Ralph W. (1889-1970)
Socrates (470 B.C.E.-399 B.C.E.)
Solon (638 B.C.E.-558 B.C.E.)
Soviet joke
Spalding, John Lancaster (1840-1916)
Spanish proverb
Stalin, Joseph (1879-1953)
Stanford Dictionary of Philosophy
Stanton, Elizabeth Cady (1815-1902)
Stein, Gertrude (1874-1946)
Steinbeck, John (1902-1968)
Steinberg, Saul (1914-1999)
Steinem, Gloria (1934-)
Stengel, Casey (1891-1975)
von Sternberg, Josef (1894-1969)
Stevenson, Adlai (1900-1965)
Stone, I. F. (1907-1989)
Storey, David (1933-2017)
Stravinsky, Igor (1882-1971)
Strindberg, August (1849-1912)
Sturgeon, Theodore (1918-1985)
Syrus, Publilius (85 B.C.E.-43 B.C.E.)
Szent-Gyorgyi, Albert (1893-1986)