"There is science, logic, reason; there is thought verified by experience. And then there is California."

"Humility is not weakness in leadership; it is the cornerstone of unassailable respect. Such is the immutable nature of understanding."

"Wisdom principle 52 tells us that the journey of life is lesson 39."

"That which today calls itself science gives us more and more information, and indigestible glut of information, and less and less understanding."

"The idea of making a film - a film that I had certainly never seen before - about the slave experience was a huge responsibility. It's a project that requires a wider understanding of the geopolitical nature of the slave trade, of historical and modern-day racism."

"The top of one mountain is always the bottom of another."

"Nature is not simply a technical or economical resource, and human beings are not mere numbers. To suggest that one can somehow align all the squabbling institutions of science, environmental management, government and diplomacy in an alliance of convenience to regulate the global climate seems to me optimistic."

"An hour spent in deep contemplation is worth a year of unguided wandering. Such is the immutable nature of understanding."