Quote by Thomas Huxley
The struggle for existence holds as much in the intellectual as in the physical world. A theory is a species of thinking, and its right to exist is coextensive with its power of resisting extinction by its rivals.
Summary
This quote highlights the idea that the struggle for survival is not limited to the physical realm but is also a significant aspect of intellectual pursuits. In this context, a theory is seen as a form of thinking, which must possess the ability to withstand challenges from competing theories in order to maintain its existence. Just like in the natural world, where only the fittest survive, intellectual theories must demonstrate their strength in order to prevail and resist being rendered obsolete by rival ideas.