"Don't despise empiric truth. Lots of things work in practice for which the laboratory has never found proof"

This quote by Martin H. Fischer is emphasizing the importance of useful experience and knowledge. He is suggesting that there are numerous things that work in practice, although the lab has actually not had the ability to offer evidence. This is a pointer that empirical truth, or knowledge gained through experience, should not be ignored. It is very important to acknowledge that useful experience can be just as valuable as scientific proof.

Fischer is encouraging us to trust our own experiences and to not be too quick to dismiss them. He is suggesting that we ought to not rely exclusively on clinical evidence, but also consider the understanding we have actually gotten through our own experiences. This quote is a suggestion that useful knowledge can be simply as valuable as scientific proof, and must not be overlooked.