The use of faith as a basis for knowledge can be found in many aspects of our lives. Whether it's faith in your teacher's advice, faith in a God, or faith in a scientific theory, it's there. But what is faith? One definition of belief in a theory of knowledge context is the confident belief or confidence in a knowledge claim by a knower, without the knower having conclusive evidence. This is because if a knowledge claim is supported by evidence, then we would use reason rather than faith as the basis for the knowledge. If we define knowledge as "true and justified belief", it can be seen that faith, being devoid of justification, can never satisfy this definition, and therefore cannot be used as a reliable basis for knowledge. However, the question arises: what would happen if a certain claim to knowledge lay outside the realm of reason? What if a knowledge claim cannot be justified by empirical evidence and reasoning alone, as in the case of a religious knowledge claim? It is then that faith allows the knower to decide what is knowledge and what is not, when something cannot be conclusively demonstrated through the use of evidence. When evaluating faith as a basis for knowledge in the natural sciences, the fact arises that without faith in the research conducted before us it is impossible to develop further knowledge about it. At the same time, however, if we had an unshakable faith in existing theories, they would never be questioned and therefore our progress of knowledge in the natural sciences would stop. While I intend to approach this essay in a balanced manner, this essay may be subject to a small degree of bias, due to my non-religious viewpoint. Today, faith is the cornerstone of all major claims of religious knowledge because there is no definitive definition. in the way of... halfway through the article... th in theory, was followed by cell theory and germ theory, allowing knowledge in the natural sciences to advance in those areas, eventually leading to the development of vaccines and stem cell research. While faith alone cannot be said to require truth, they are by no means useless as a basis for knowledge in the fields of knowledge of religion and the natural sciences. Faith allows the knower to make the decision about what is knowledge and what is not, even when the knowledge claim cannot be justified by empirical evidence or reasoning. At the same time, however, this quality of faith makes it useless for finding absolute truth. In the natural sciences, faith can be seen both as a necessity, as it is essential for the construction of knowledge, and as it must also be questioned, as the progress of science occurs through the refutation of current theories.