“We may make progress only by freeing ourselves from the rut of the past, but without this rut an orderly society would hardly be possible in the first place.”

As quoted in the Sunday Mail, Glasgow.

Memoirs of a Revolutionist (1899) http://dwardmac.pitzer.edu/anarchist_archives/kropotkin/memoirs/memoirstoc.html Part IV, Sect. 3 http://dwardmac.pitzer.edu/anarchist_archives/kropotkin/memoirs/memoirs4_3.html
Context: Belief in an ice-cap reaching Middle Europe was at that time rank heresy; but before my eyes a grand picture was rising, and I wanted to draw it, with the thousands of details I saw in it; to use it as a key to the present distribution of floras and faunas; to open new horizons for geology and physical geography.
But what right had I to these highest joys, when all around me was nothing but misery and struggle for a mouldy bit of bread; when whatsoever I should spend to enable me to live in that world of higher emotions must needs be taken from the very mouths of those who grew the wheat and had not bread enough for their children? From somebody's mouth it must be taken, because the aggregate production of mankind remains still so low.
Knowledge is an immense power. Man must know. But we already know much! What if that knowledge — and only that — should become the possession of all? Would not science itself progress in leaps, and cause mankind to make strides in production, invention, and social creation, of which we are hardly in a condition now to measure the speed?

Free speech in an age of identity politics (2015)

(1847)

Section 9 : Ethical Outlook
Founding Address (1876), Life and Destiny (1913)
Context: There may be, and there ought to be, progress in the moral sphere. The moral truths which we have inherited from the past need to be expanded and restated. In times of misfortune we require for our support something of which the truth is beyond all question, in which we can put an implicit trust, " though the heavens should fall." A merely borrowed belief is, at such time, like a rotten plank across a raging torrent. The moment we step upon it, it gives way beneath our feet.

Source: Letter to his daughter (1978), p. 15.
Context: What gift can I give you from this cell out of which my hand cannot pass? I give you the hand of the people. What celebration can I hold for you? I give you the celebration of a celebrated memory and a celebrated name. You are the heir to and inheritor of the most ancient civilization. Please make your full contribution to making this ancient civilization the most progressive and the most powerful. By progressive and powerful I do not mean the most dreaded. A dreaded society is not a civilized society. The most progressive and powerful society in the civilized sense, is a society which has recognized its ethos, and come to terms with the past and the present, with religion and science, with modernism and mysticism, with materialism and spirituality; a society free of tension, a society rich in culture. Such a society cannot come with hocus-pocus formulas and with fraud. It has to flow from the depth of a divine search. In other words, a classless society has to emerge but not necessarily a Marxist society. The Marxist society has created its own class structure.

Section 101
The True Believer (1951), Part Three: United Action and Self-Sacrifice
Context: Collective unity is not the result of the brotherly love of the faithful for each other. The loyalty of the true believer is to the whole — the church, party, nation — and not to his fellow true believer. True loyalty between individuals is possible only in a loose and relatively free society.

The Gay Science (1882)

p, 125
Astronomical Observations relating to the Construction of the Heavens... (1811)