Marcus Aurelius: Withdraw yourself
It is in your power to withdraw yourself whenever you desire. Perfect tranquility within consists in the good ordering of the mind, the realm of your own.
Marcus Aurelius (Latin: Marcus Aurelius Antoninus Augustus; Rome, 26 April 121 AD - Vindobona or Sirmium, 17 March 180 AD) was a Roman Emperor from 161 to 180. He ruled with Lucius Verus as co-emperor from 161 until Verus' death in 169. He was the last of the Five Good Emperors, and is also considered one of the most important Stoic philosophers. Marcus Aurelius' Stoic tome Meditations, written in Greek while on campaign between 170 and 180, is still revered as a literary monument to a philosophy of service and duty, describing how to find and preserve equanimity in the midst of conflict by following nature as a source of guidance and inspiration.
Epictetus: Imagined anxieties
Man is not worried by real problems so much as by his imagined anxieties about real problems.
Epictetus (Hierápolis, AD 55 - Nicópolis, 135) was a Greek sage and Stoic philosopher. He was brought as a Greek slave from Hierapolis, Phrygia (southwest Anatolia present day Pamukkale, Turkey ) to Rome, released and then exiled. After his release, he taught the philosophy of the Stoics first in Rome and later in Nicopolis (northwestern Greece),in a school founded by him.
Together with other Roman philosophers such as Seneca and Marcus Aurelius Epictetus was one of the leading figures in the Stoic philosophy in the first centuries after Christ. Epictetus didn't write anything himself, but his pupil and admirer Arrian has composed eight books of learning conversations of Epictetus, of which four books have been preserved. Arrian also put together the Manual Booklet (Encheiridion): a collection of 53 quotes from Epictetus. The practical advice given herein are even now found worth while.
Socrates: To be contented
He who is not contented with what he has, would not be contented with what he would like to have.
Socrates ( 470/469 - 399 BC) was a classical Greek (Athenian) philosopher credited as one of the founders of Western philosophy. He is an enigmatic figure known chiefly through the accounts of classical writers, especially the writings of his students Plato and Xenophon and the plays of his contemporary Aristophanes. Plato's dialogues are among the most comprehensive accounts of Socrates to survive from antiquity, though it is unclear the degree to which Socrates himself is "hidden behind his 'best disciple', Plato".
Eckhart Tolle: Free of the mind
The moment that judgement stops through acceptance of what it is, you are free of the mind. You have made room for love, for joy, for peace.
Eckhart Tolle ( born Ulrich Leonard Tölle, February 16, 1948) is a German-born resident of Canada, best known as the author of The Power of Now and A New Earth: Awakening to your Life's Purpose. In 2011, he was listed by Watkins Review as the most spiritually influential person in the world. In 2008, a New York Times writer called Tolle "the most popular spiritual author in the United States"
Roy T. Bennett: Your happiness now
Do not set aside your happiness. Do not wait to be happy in the future. The best time to be happy is always now.
Roy T. Bennett is the author of the book: The Light in the Heart.
Until now, I could find no more information about him.