Section 17: About Titus Flavius Heraclius Polis.
Section 18: About Aurelius Augustine.
Section 19: About Abu Nasr Mohammad ibn Mohammad Farabi.
Section 20: About Abu Ali Hussein ibn Abdullah ibn Hassan ibn Ali ibn Sina.
Section 21: About Thomas Aquinas.
Section 22: About Rene Descartes.
Section 23: About Baruch Spinoza.
Section 25: About Jean-Jacques Rousseau.
Section 26: About Immanuel Kant.
Section 27: About Georg Wilhelm Friedrich Hegel.
Section 28: About Arthur Schopenhauer.
Section 29: About Friedrich Nietzsche.