“The Earth with its scarred face is the symbol of the Past; the Air and Heaven, of Futurity.”

Preface to Humane Biology Projects (1961) by the Animal Welfare Institute
Context: I like to define biology as the history of the earth and all its life — past, present, and future. To understand biology is to understand that all life is linked to the earth from which it came; it is to understand that the stream of life, flowing out of the dim past into the uncertain future, is in reality a unified force, though composed of an infinite number and variety of separate lives.

Complete Works of Master Zhang, "Supplements to Reflections on Things at Hand", as quoted in Wang Chunyong's Famous Chinese Sayings Quoted by Wen Jiabao, trans. Chan Sin-wai (Hong Kong: Chung Hwa Book Co., 2009), p. 10

The Husbandman's Life, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

Source: White Oleander

"All Pervading Consciousness"
Context: Yet what are seas and what is air? For all
Is God, and but a talisman are heaven and earth
To veil Divinity. For heaven and earth,
Did He not permeate them, were but names;
Know then, that both this visible world and that
Which unseen is, alike are God Himself,
Naught is, save God: and all that is, is God.

Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 407.

Source: The Soldiers of Halla

The Road to the Sea, p. 265
2000s and posthumous publications, The Collected Stories of Arthur C. Clarke (2001)