| Selections from: |
| Plato (429-347) |
| Aristotle (384-322) |
| Plotinus (205-270) |
| Shaftesbury (1671-1713) |
| Hume (1711-1776) |
| Kant (1724-1804) |
| Burke (1729-1797) |
| Schiller (1759-1805) |
| Hegel (1770-1831) |
| Schopenhauer (1788-1860) |
| Tolstoy (1828-1910) |
| Croce (1866-1952) |
| Kandinsky (1866-1944) |
| Bullough (1880-1934) |
| Bell (1881-1964) |