
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting
The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Gilbert Keith Chesterton, as per Mackay's The Harvest of a Quiet Eye, A Selection of Scientific Quotations (1977), p. 34.
Misattributed
As quoted in Mackay's The Harvest of a Quiet Eye, A Selection of Scientific Quotations (1977), p. 34
The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting
“No battle can be won in the study, and theory without practice is dead.”
Quoted in K. Ossipov, "Suvorov", 1945.
Healing
One Minute Wisdom (1989)
Source: Awareness: A de Mello Spirituality Conference in His Own Words
“Happy are the beloved and the lovers and those who can live without love.”
“Those who are without compassion cannot see what is seen with the eyes of compassion.”
Source: The Miracle of Mindfulness: An Introduction to the Practice of Meditation