“There is no royal road to science, and only those who do not dread the fatiguing climb of its steep paths have a chance of gaining its luminous summits.”

Bequest to the Academic Youth of Soviet Russia (1936).

Frag. B 2.2-6, quoted by Proclus, Commentary on the Timaeus I, 345

(Che) nessuna scienza
Senz’ ammaestratura
Non saglie in grande altura
Per proprio sentimento.
Canzone. (Poeti del Primo Secolo, Firenze, 1816, Vol. I, p. 83).
Translation reported in Harbottle's Dictionary of quotations French and Italian (1904), p. 369.

Preface to the Second Edition
The Grammar of Science (1900)

"Self-Culture", an address in Boston (September 1838)
Context: The path to perfection is difficult to men in every lot; there is no royal road for rich or poor. But difficulties are meant to rouse, not discourage. The human spirit is to grow strong by conflict. And how much has it already overcome! Under what burdens of oppression has it made its way for ages What mountains of difficulty has it cleared! And with all this experience, shall we say that the progress of the mass of men is to be despaired of; that the chains of bodily necessity are too strong and ponderous to be broken by the mind; that servile, unimproving drudgery is the unalterable condition of the multitude of the human race?

2009, Speech: The Socio-Economic Peace Program of Senator Francis Escudero

White Fang (1906)

II.263
Human, All Too Human (1878)

Morihei Ueshiba, as quoted in You Can Save the Earth: 7 Reasons Why and 7 Simple Ways, a Philosophy for the Future (2008) by Hatherleigh, Sean K. Smith, and Andrew Flach, p. 92
Context: Each and every master, regardless of the era or the place, heard the call and attained harmony with heaven and earth. There are many paths leading to the top of Mount Fuji, but there is only one summit — love.