“Reform the world within thyself, which is thy proper world.”

“Make it thy business to know thyself, which is the most difficult lesson in the world.”

Miguel de Cervantes (1547–1616) Spanish novelist, poet, and playwright

“Transform the divided individual into the world-personality; let all thyself be the divine. This is thy goal.”

Sri Aurobindo (1872–1950) Indian nationalist, freedom fighter, philosopher, yogi, guru and poet

“The highest strength is acquired not in overcoming the world, but in overcoming one’s self. Learn to be cruel to thyself, to withstand thy appetites, to bear thy sufferings, and thou shalt become free and able.”

John Lancaster Spalding (1840–1916) Catholic bishop

“Deny thyself, take up thy cross, and follow me. This is war, not peace. It is battle declared against the world, the flesh, and the devil. In me said Christ, "ye have peace,"—not in the world; there is no promise of it there.”

Anna Shipton (1815–1901) British religious writer

“The latest Gospel in this world is, Know thy work and do it. 'Know thyself:' long enough has that poor 'self' of thine tormented thee; thou wilt never get to 'know' it, I believe! Think it not thy business, this of knowing thyself; thou art an unknowable individual: know what thou canst work at; and work at it, like a Hercules! That will be thy better plan.”

Thomas Carlyle (1795–1881) Scottish philosopher, satirical writer, essayist, historian and teacher

“Know thyself' was written over the portal of the antique world. Over the portal of the new world, 'Be thyself' shall be written.”

Oscar Wilde book The Soul of Man under Socialism

“Be conscious first of thyself within, then think and act. All living thought is a world in preparation; all real act is a thought manifested. The material world exists because an Idea began to play in divine self-consciousness.”

Sri Aurobindo (1872–1950) Indian nationalist, freedom fighter, philosopher, yogi, guru and poet

“To reform the world - means to reform upbringing…”

Janusz Korczak (1878–1942) Polish physician and writer

“2762. In Matters of Slander, thou oughtest to suspend thy Judgment, and examine the Thing; and not, as the common Custom is, persuade thyself, that common Report is sufficient warrant for the Truth of the Matters. Popular Opinion is the greatest Lie in the World.”

Thomas Fuller (writer) (1654–1734) British physician, preacher, and intellectual