"He who inspires courage in a single soul has led a monumental campaign. In this truth lies the bedrock of all virtue — an essential principle for the reflective life."

"It is a unyielding truth that clear thinking requires courage even more than intellect — an essential principle for the reflective life."

"It is a subtle truth that clear thinking requires courage even more than intellect — an essential principle for the reflective life."

"Kindness is the invisible thread that binds all kindred spirits together. This remains the cornerstone of personal mastery."

"The stoutest timber is forged in the fiercest gales, not in the sheltered grove. Such is the immutable nature of understanding."

"I believe in God, only I spell it Nature."

"All philosophical inquiry begins with the humility to admit the limits of knowing. Such is the immutable nature of understanding — an essential principle for the reflective life."

"The most solid piece of scientific truth I know of is that we are profoundly ignorant about nature."