“What vexations there are in the external customs which are thought to belong to religion, but which in reality are related to ecclesiastical form! The merits of piety have been set up in such away that the ritual is of no use at all except for the simple submission of the believers to ceremonies and observances, expiations and mortifications (the more the better). But such compulsory services, which are mechanically easy (because no vicious inclination is thus sacrificed), must be found morally very difficult and burdensome to the rational man. When, therefore, the great moral teacher said, 'My commandments are not difficult,' he did not mean that they require only limited exercise of strength in order to be fulfilled. As a matter of fact, as commandments which require pure dispositions of the heart, they are the hardest that can be given. Yet, for a rational man, they are nevertheless infinitely easier to keep than the commandments involving activity which accomplishes nothing... [since] the mechanically easy feels like lifting hundredweights to the rational man when he sees that all the energy spent is wasted.”

Austin (1975, p. 18–19) as cited in: James Loxley (2006) Performativity. p. 81.

Source: The structure of social action (1937), p. 8

Preface
A Course of Lectures on Natural Philosophy and the Mechanical Arts (1807)

I. The Principle of Superposition - 1. The Need for a Quantum Theory
The Principles of Quantum Mechanics (4th ed. 1958)

Pithy Aphorisms: Wise Saying and Counsels, Edited by Mansoor Limba, Tehran: The Institute for Compilation and Publication of Imam Khomeini’s Works -- International Affairs Department. p. 7.
Theology and Mysticism

1960s, The Quest for Peace and Justice (1964)
Context: Every man lives in two realms, the internal and the external. The internal is that realm of spiritual ends expressed in art, literature, morals, and religion. The external is that complex of devices, techniques, mechanisms, and instrumentalities by means of which we live. Our problem today is that we have allowed the internal to become lost in the external. We have allowed the means by which we live to outdistance the ends for which we live. So much of modern life can be summarized in that arresting dictum of the poet Thoreau: "Improved means to an unimproved end". This is the serious predicament, the deep and haunting problem confronting modern man. If we are to survive today, our moral and spiritual "lag" must be eliminated. Enlarged material powers spell enlarged peril if there is not proportionate growth of the soul. When the "without" of man's nature subjugates the "within", dark storm clouds begin to form in the world.

From an essay in A Defense of Indian Culture, as quoted in The Vision of India (1949) by Sisirkumar Mitra
Context: Spirituality is the master key of the Indian mind. It is this dominant inclination of India which gives character to all the expressions of her culture. In fact, they have grown out of her inborn spiritual tendency of which her religion is a natural out flowering. The Indian mind has always realized that the Supreme is the Infinite and perceived that to the soul in Nature the Infinite must always present itself in an infinite variety of aspects. The aggressive and quite illogical idea of a single religion for all mankind, a religion universal by the very force of its narrowness, one set of dogmas, one cult, one system of ceremonies, one ecclesiastical ordinance, one array of prohibitions and injunctions which all minds must accept on peril of persecution by men and spiritual rejection or eternal punishment by God, that grotesque creation of human unreason which has been the parent of so much intolerance, cruelty and obscurantism and aggressive fanaticism, has never been able to take firm hold of the Indian mentality.

Source: The Theory of the Leisure Class (1899), p. 125

Source: Forced to be Free (1971), p. 69, quotation is from A. J. Vidich and J. Bensman, Small Town in Mass Society (New York), p. 315