You should respect each other and refrain from disputes; you should not, like water and oil, repel each other, but should, like milk and water, mingle together.
Faith is harder to shake than knowledge, love succumbs less to change than respect, hate is more enduring than aversion, and the impetus to the mightiest upheavals on this earth has at all times consisted less in a scientific knowledge dominating the masses than in a fanaticism which inspired them and sometimes in a hysteria which drove them forward.
We are an intelligent species and the use of our intelligence quite properly gives us pleasure. In this respect the brain is like a muscle. When we think well, we feel good. Understanding is a kind of ecstasy.
The scientist is activated by a wonder and awe before the mysterious comprehensibility of the universe which is yet finally beyond his grasp. In its profoundest depths it is inaccessible to man.
The greatest difficulty is that men do not think enough of themselves, do not consider what it is that they are sacrificing when they follow in a herd, or when they cater for their establishment.