There does not exist a category of science to which one can give the name applied science. There are science and the applications of science, bound together as the fruit of the tree which bears it.
Interpretation
Science and its applications are intertwined; applications arise from scientific knowledge.
Louis Pasteur's quote emphasizes that applied science is not a separate category from science itself; rather, it represents the practical applications of scientific principles. Science is foundational, and its applications are a natural extension of the knowledge it provides, indicating that the two are inseparable and equally essential in advancing human understanding and innovation.
In practice
In a lecture about the importance of scientific research, this quote can illustrate the connection between theory and practice.
To demonstrate experimentally that a microscopic organism actually is the cause of a disease and the agent of contagion, I know no other way, in the present state of Science, than to subject the microbe (the new and happy term introduced by M. Sédillot) to the method of cultivation out of the body.
The universe is an asymmetrical entity. I am inclined to believe that life as it is manifested to us must be a function of the asymmetry of the universe or of the consequence of this fact. The universe is asymmetrical; for if one placed the entire set of bodies that compose the solar system, each moving in its own way, before a mirror, the image shown would not be superimposable on the reality.
These are the living springs of great thoughts and great actions. Everything grows clear in the reflections from the Infinite.
Without theory, practice is but routine born of habit. Theory alone can bring forth and develop the spirit of invention. ... [Do not] share the opinion of those narrow minds who disdain everything in science which has not an immediate application. ... A theoretical discovery has but the merit of its existence: it awakens hope, and that is all. But let it be cultivated, let it grow, and you will see what it will become.
These three things-work, will, success-fill human existences. Will opens the door to success, both brilliant and happy. Work passes these doors, and at the end of the journey success comes in to crown one's efforts.
Chance favors those who are prepared.
We already have the statistics for the future: the growth percentages of pollution, overpopulation, desertification. The future is already in place.
If there is anything that can bind the heavenly mind of man to this dreary exile of our earthly home and can reconcile us with our fate so that one can enjoy living,-then it is verily the enjoyment of the mathematical sciences and astronomy.
The primitive fight-or-flight regions of our mammalian brains react to immediate danger. We instinctively run from an avalanche but the gradual retreat of a glacier, the portent of the far greater danger of rising temperatures and rising oceans, just doesn't get through to us in the same way.
What is especially striking and remarkable is that in fundamental physics a beautiful or elegant theory is more likely to be right than a theory that is inelegant.
As followers of natural science we know nothing of any relation between thoughts and the brain, except as a gross correlation in time and space.
All illnesses have some heredity contribution. It's been said that genetics loads the gun and environment pulls the trigger.
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