Louis Pasteur (Dec. 27, 1822-Sept. 28, 1895) was a French chemist and microbiologist, perhaps the greatest scientist of all time. In Charles Murray's study of excellence in science and the arts, Human Accomplishment, Pasteur is rated the most significant figure in history in the field of medicine. He invented the process that keeps milk from going sour, known now as pasteurization. He also performed experiments that confirmed the germ theory of disease, created the first rabies, anthrax and chicken cholera vaccines, was a founder of bacteriology and made numerous discoveries in chemistry. Pasteur explained a scientific basis for the process of fermentation, wine-making, and the brewing of beer. "He debunked the widely accepted myth of spontaneous generation, thereby setting the stage for modern biology and biochemistry." 
A devout Christian who prayed in his laboratory, Pasteur was also the Dean of the faculty of sciences at Lille University. In 1887 he founded the Pasteur Institute, which studies biology at the forefront of the battle against infectious disease.
Pasteur rejected the theory of evolution:
|“||When he was asked if he believed in evolution, he said, "no."||”|
Pasteur's brilliant and daring development of the rabies vaccine and his use of it to save a 9-year-old boy's life after he had been repeatedly bitten by a rabid dog is one of the most inspiring incidents in all of science. Pasteur risked his own freedom in saving the boy, as Pasteur was not a licensed physician.
Resistance to his ideas
Medical "experts" of his time attempted to discredit and punish Pasteur in 1870s, as depicted in a movie produced in 1936 and viewable today in its entirety on YouTube.
Discovery of vaccination
Coming back from a long vacation, he used cultures of disease-causing anthrax bacteria in an attempt to make more (in live birds), but the birds didn't get sick.
Science and religion
Pasteur was a devout Christian, and did not see any conflict between science and Christianity, remarking that "a bit of science distances one from God, but much science nears one to Him." Pasteur experienced many hardships throughout his life, including the death of three of his five children to childhood diseases including polio, but these hardships only served to strengthen his faith and his determination to find cures. Through it all Pasteur gave God the glory, stating that "the more I study nature, the more I stand amazed at the work of the Creator."
"If one were to choose among the greatest benefactors of humanity, Louis Pasteur would certainly rank at the top."(Ibidem)
Chance favors the prepared mind.
A bit of science distances one from God, but much science nears one to Him.
The more I study nature, the more I stand amazed at the work of the Creator.
The role of the infinitely small in nature is infinitely great.
Question your priorities often, make sure God always comes first.
Inspiration is the impact of a fact on a well-prepared mind.
Science knows no country, because knowledge belongs to humanity, and is the torch which illuminates the world. Science is the highest personification of the nation because that nation will remain the first which carries the furthest the works of thought and intelligence.
Let me tell you the secret that has led me to my goal. My strength lies solely in my tenacity.
The 2011 Nobel Prize laureate in physiology or medicine Ralph M. Steinman was inspired by Pasteur with respect to possibility to exploit so called Dendritic cells for creating vaccines.
- Murray, Charles, Human Accomplishment, HarperCollins ebook, (2003), location 2553 of 15117.
- Resistance by Scientists to Scientific Discovery by Bernard Barber
- Michel C. Nussenzweig (December 7, 2011). Nobel Lecture on behalf of the late Ralph M. Steinman. nobelprize.org. Retrieved on December 13, 2014. “(28min:50sec) … But he was even more excited about the possibility to exploiting them to create vaccines. Ralph was inspired by Pasteur. But he liked to point out that Pastuer was a microbiologist and created vaccines by attenuating microbes and that most vaccines were created in this manner and that we immonologists have not made many vaccines. He had discovered that Dendritic cells initiated immunity and controlled its quality and the question he was buring to answer was: Can Dendritic cells be harnessed to discover vaccines?”