"Perhaps there is no literature in Europe that mirrors so clearly as the Portuguese, the painful conflict in the minds of people who, on the one hand, by their humanistic education, not only knew better but also more uncritically admired, ancient learning than their medieval predecessors, and, who, on the other hand, in the same epoch, were confronted with abundant proofs of the insufficiency and fallibility of that same Antiquity."

“Our thesis now is that the Portuguese seafarers and scientists of the 15th and 16th centuries made an important contribution to the rise of modern science by unintentionally undermining the belief in scientific authorities and by strengthening the confidence in an empirical, natural, historical method.”

“In the first chapter of Genesis it is made evident that absolutely nothing, except God, has any claim to divinity; even the sun and the moon, supreme gods of the neighbouring peoples, are set in their places between the herbs and the animals and are brought into the service of mankind.”

“Pascal scornfully said that simple workmen had been able to convince of error those great men that are called 'philosophers'. It was, then, these unlearned men... who were most ready to believe 'what they saw with their eyes and touched with their hands'.”

“The Portuguese had undertaken their voyages towards the southern hemisphere in spite of the science of their day... they followed an irresistible urge, which went against their scientific and religious convictions.”