“Imagination is an infinite resource that cannot be diminished by overuse or underuse.”

The Notebooks of Leonardo da Vinci (1883), III Six books on Light and Shade

1 September 1875, page 226
John of the Mountains, 1938
Context: How infinitely superior to our physical senses are those of the mind! The spiritual eye sees not only rivers of water but of air. It sees the crystals of the rock in rapid sympathetic motion, giving enthusiastic obedience to the sun's rays, then sinking back to rest in the night. The whole world is in motion to the center. So also sounds. We hear only woodpeckers and squirrels and the rush of turbulent streams. But imagination gives us the sweet music of tiniest insect wings, enables us to hear, all round the world, the vibration of every needle, the waving of every bole and branch, the sound of stars in circulation like particles in the blood. The Sierra canyons are full of avalanche debris — we hear them boom again, for we read past sounds from present conditions. Again we hear the earthquake rock-falls. Imagination is usually regarded as a synonym for the unreal. Yet is true imagination healthful and real, no more likely to mislead than the coarser senses. Indeed, the power of imagination makes us infinite.

p, 125
Man a Machine (1747)

Source: The Long Emergency (2005), Chapter 3, p. 68.

A Footnote To Rally The Academic, p. 164.
In Defence Of Politics (Second Edition) – 1981

Source: Vestiges of the Natural History of Creation (1844), p. 156-157
Context: To a reasonable mind the Divine attributes must appear, not diminished or reduced in any way, by supposing a creation by law, but infinitely exalted. It is the narrowest of all views of the Deity, and characteristic of a humble class of intellects, to suppose him acting constantly in particular ways for particular occasions. It, for one thing, greatly detracts from his foresight, the most undeniable of all the attributes of Omnipotence. It lowers him towards the level of our own humble intellects. Much more worthy of him it surely is, to suppose that all things have been commissioned by him from the first, though neither is he absent from a particle of the current of natural affairs in one sense seeing that the whole system is continually supported by his providence.

Source: Dead and Alive

Commentarius in VIII Libros Physicorum Aristoteles (c. 1230-1235)

C. K. Prahalad, cited in: David A. Aaker (2001), Strategic Market Management, p. 76