Science does not know its debt to imagination.
There are always difficulties arising which tempt you to believe that your critics are right. To map out a course of action and follow it to an end requires courage.
The health of the eye seems to demand a horizon. We are never tired, so long as we can see far enough.
One man’s justice is another’s injustice; one man’s beauty, another’s ugliness; one man’s wisdom, another’s folly.
The ancestor of every action is a thought… Thought is the blossom; language the bud; action the fruit behind it.