One can have no smaller or greater mastery than mastery of oneself
Leonardo da VinciThe noblest pleasure is the joy of understanding
Leonardo da VinciAll our knowledge has its origin in our perceptions
Leonardo da VinciIf you are alone you belong entirely to yourself. If you are accompanied by even one companion you belong only half to yourself or even less in proportion to the thoughtlessness of his conduct and if you have more than one companion you will fall more deeply into the same plight
Leonardo da VinciThe greatest deception men suffer is from their own opinions
Leonardo da Vinci