The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
“Those who are in love with practice without knowledge are like the sailor who gets into a ship without rudder or compass and who never can be certain whether he is going. Practice must always be founded on sound theory, and to this Perspective is the guide and the gateway; and without this nothing can be done well in the matter of drawing.”
The Notebooks of Leonardo da Vinci (1883), I Prolegomena and General Introduction to the Book on Painting
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Leonardo Da Vinci 363
Italian Renaissance polymath 1452–1519Related quotes
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