“If the mind is to emerge unscathed from this relentless struggle with the unforeseen, two qualities are indispensable: first, an intellect that, even in the darkest hour, retains some glimmerings of the inner light which leads to truth; and second, the courage to follow this faint light wherever it may lead.”

“...as man under pressure tends to give in to physical and intellectual weakness, only great strength of will can lead to the objective.”

“Boldness governed by superior intellect is the mark of a hero.”

“Pity the theory which sets itself in opposition to the mind! It cannot repair this contradiction by any humility, and the humbler it is so much the sooner will ridicule and contempt drive it from real life.”

“No one starts a war--or rather, no one in his sense ought to do so--without first being clear in his mind what he intends to achieve by the war and how he intends to conduct it.”

“...an intellectual instinct which extracts the essence from the phenomena of life, as a bee sucks honey from a flower. In addition to study and reflections, life itself serves as a source.”

“Our knowledge of circumstances has increased, but our uncertainty, instead of having diminished, has only increased. The reason of this is, that we do not gain all our experience at once, but by degrees; so our determinations continue to be assailed incessantly by fresh experience; and the mind, if we may use the expression, must always be under arms.”