“Men remain in their present low and primitive condition; but if they should feel the influence of the spring of springs arousing them, they would of necessity rise to a higher and more ethereal life.”

Closing words of graveside oration at the funeral of Jeremiah O'Donovan Rossa, 1 August 1915. The Cause Of Ireland, Liz Curtis, Beyond the Pale Publications, Belfast 1994, pg 266
Context: Our foes are strong and wise and wary; but, strong and wise and wary as they are, they cannot undo the miracles of God Who ripens in the hearts of young men the seeds sown by the young men of a former generation. And the seeds sown by the young men of '65 and '67 are coming to their miraculous ripening today. Rulers and Defenders of the Realm had need to be wary if they would guard against such processes. Life springs from death; and from the graves of patriot men and women spring living nations. The Defenders of this Realm have worked well in secret and in the open. They think that they have pacified Ireland. They think that they have purchased half of us and intimidated the other half. They think that they have foreseen everything, think that they have provided against everything; but, the fools, the fools, the fools! — They have left us our Fenian dead, and while Ireland holds these graves, Ireland unfree shall never be at peace.

"Sorrow-Acre"
Winter's Tales (1942)

Liebe, Arbeit und Wissen sind die Quellen unseres Lebens. Sie sollen es auch regieren.
His personal motto; the German phrase is found in the preamble of Charakteranalyse (1971 [1933]); the English translation was used at least as early as The Function of the Orgasm (1948), a translation of Die Funktion des Orgasmus (1927).

Contemplations.

Die Liebe wintert nicht;
Nein! nein!
Ist und bleibt Fruhlingesschein.
"Herbstlied", line 22, from Friedrich Schiller (ed.), Musen-Almanach für das Jahr 1799 (1798); translation from W. B. T., Every Morning (London: William Tegg, 1874), p. 71.

"A Half Life" (1990), pp. 302-303
It All Adds Up (1994)
Context: There's something that remains barbarous in educated people, and lately I've more and more had the feeling that we are nonwondering primitives. And why is it that we no longer marvel at these technological miracles? They've become the external facts of every life. We've all been to the university, we've had introductory courses in everything, and therefore we have persuaded ourselves that if we had the time to apply ourselves to these scientific marvels, we would understand them. But of course that's an illusion. It couldn't happen. Even among people who have had careers in science. They know no more about how it all works than we do. So we are in the position of savage men who, however, have been educated into believing that they are capable of understanding everything. Not that we actually do understand, but that we have the capacity.

The Autocrat of the Breakfast Table (1858)

Source: Talks for the Times (1896), "The Importance of Correct Ideals" (1892), p. 281