“The skeptical view appears to me out of harmony with the inductive philosophy.”

Kant (2006; 2014), Introduction

1940s, Philosophy for Laymen (1946)
Context: The demand for certainty is one which is natural to man, but is nevertheless an intellectual vice. If you take your children for a picnic on a doubtful day, they will demand a dogmatic answer as to whether it will be fine or wet, and be disappointed in you when you cannot be sure. The same sort of assurance is demanded, in later life, of those who undertake to lead populations into the Promised Land. “Liquidate the capitalists and the survivors will enjoy eternal bliss.” “Exterminate the Jews and everyone will be virtuous.” “Kill the Croats and let the Serbs reign.” “Kill the Serbs and let the Croats reign.” These are samples of the slogans that have won wide popular acceptance in our time. Even a modicum of philosophy would make it impossible to accept such bloodthirsty nonsense. But so long as men are not trained to withhold judgment in the absence of evidence, they will be led astray by cocksure prophets, and it is likely that their leaders will be either ignorant fanatics or dishonest charlatans. To endure uncertainty is difficult, but so are most of the other virtues. For the learning of every virtue there is an appropriate discipline, and for the learning of suspended judgment the best discipline is philosophy.
But if philosophy is to serve a positive purpose, it must not teach mere skepticism, for, while the dogmatist is harmful, the skeptic is useless. Dogmatism and skepticism are both, in a sense, absolute philosophies; one is certain of knowing, the other of not knowing. What philosophy should dissipate is certainty, whether of knowledge or of ignorance.

pg 51.
Science in a Free Society (1978)

Persecution and the Art of Writing (1952), Introduction

Principles of Mathematics (1903), Ch. II: Symbolic Logic, p. 11
1900s

Statement to German anti-Nazi diplomat and author Prince Hubertus zu Lowenstein around 1941, as quoted in his book Towards the Further Shore : An Autobiography (1968)
Attributed in posthumous publications

Source: The Meaning of Culture (1929), pp. 27-28

The Conduct Of Life (1951)
Context: Now life is the only art that we are required to practice without preparation, and without being allowed the preliminary trials, the failures and botches, that are essential for the training of a mere beginner. In life, we must begin to give a public performance before we have acquired even a novice's skill; and often our moments of seeming mastery are upset by new demands, for which we have acquired no preparatory facility. Life is a score that we play at sight, not merely before we have divined the intentions of the composer, but even before we have mastered our instruments; even worse, a large part of the score has been only roughly indicated, and we must improvise the music for our particular instrument, over long passages. On these terms, the whole operation seems one of endless difficulty and frustration; and indeed, were it not for the fact that some of the passages have been played so often by our predecessors that, when we come to them, we seem to recall some of the score and can anticipate the natural sequence of the notes, we might often give up in sheer despair. The wonder is not that so much cacophony appears in our actual individual lives, but that there is any appearance of harmony and progression.

Source: Testimony: its Posture in the Scientific World (1859), p. 7
Context: Just suppose for a moment that every fact reported to us by others were viewed in the light of the skeptical system, as to the fallaciousness of the senses and the tendency to self-deception. Should we not from that moment be at a stand-still in all the principal movements of our lives?