“Time stays long enough for those who use it.”

“There are three classes of people: those who see. Those who see when they are shown. Those who do not see.”

“Anyone who conducts an argument by appealing to authority is not using his intelligence; he is just using his memory.”

“I abhor the supreme folly of those who blame the disciples of nature in defiance of those masters who were themselves her pupils”

“Those who, in debate, appeal to their qualifications, argue from memory, not from understanding.”

“I have from an early age abjured the use of meat, and the time will come when men such as I will look upon the murder of animals as they now look upon the murder of men.”

“I love those who can smile in trouble, who can gather strength from distress, and grow brave by reflection. 'Tis the business of little minds to shrink, but they whose heart is firm, and whose conscience approves their conduct, will pursue their principles unto death”