“Every person who seeks to practise agriculture with the full success which it admits—and that is the natural aim of every one who engages in it—must possess energy, activity, reflection, perseverance, and a knowledge of all the kindred and accessory sciences.”

Letter in response to sixth-grader Phyllis Wright, asking whether scientists pray, and if so, what they pray for (24 January 1936) p. 92-93
Attributed in posthumous publications, Einstein and Religion (1999)

Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 382
Regarding Knowledge & Wisdom, General

Prose Quotations from Socrates to Macaulay, 1880

Source: Guide for the Perplexed (c. 1190), Part III, Ch.21
Context: He fully knows His unchangeable essence, and has thus a knowledge of all that results from any of His acts. If we were to try to understand in what manner this is done, it would be the same as if we tried to be the same as God, and to make our knowledge identical with His knowledge. Those who seek the truth, and admit what is true, must believe that nothing is hidden from God; that everything is revealed to His knowledge, which is identical with His essence; that this kind of knowledge cannot be comprehended by us; for if we knew its method, we would possess that intellect by which such knowledge could be acquired.... Note this well, for I think that this is an excellent idea, and leads to correct views; no error will be found in it; no dialectical argument; it does not lead to any absurd conclusion, nor to ascribing any defect to God. These sublime and profound themes admit of no proof whatever... In all questions that cannot be demonstrated, we must adopt the method which we have adopted in this question about God's Omniscience. Note it.

Why I Am An Agnostic (1929)
Context: An agnostic is a doubter. The word is generally applied to those who doubt the verity of accepted religious creeds of faiths. Everyone is an agnostic as to the beliefs or creeds they do not accept. Catholics are agnostic to the Protestant creeds, and the Protestants are agnostic to the Catholic creed. Any one who thinks is an agnostic about something, otherwise he must believe that he is possessed of all knowledge. And the proper place for such a person is in the madhouse or the home for the feeble-minded. In a popular way, in the western world, an agnostic is one who doubts or disbelieves the main tenets of the Christian faith.

From Richard Brinsley Sheridan's Pizarro, Act I, sc. i.
Misattributed

Source: Kritik der zynischen Vernunft [Critique of Cynical Reason] (1983), p. 77

What is to be Done? (1902)

Life and the Poet (1942)
Context: The ultimate aim of politics is not politics, but the activities which can be practised within the political framework of the State. Therefore an effective statement of these activities — e. g. science, art, religion — is in itself a declaration of ultimate aims around which the political means will crystallise … a society with no values outside of politics is a machine carrying its human cargo, with no purpose in its institutions reflecting their care, eternal aspirations, loneliness, need for love.