Yes, Einstein expressed a philosophical stance that we cannot prove anything with absolute certainty. He was known for his skepticism regarding the notion of absolute truth and held the view that scientific knowledge is always provisional and subject to revision.
One of Einstein's famous quotes related to this perspective is: "As far as the laws of mathematics refer to reality, they are not certain, and as far as they are certain, they do not refer to reality." This statement reflects his belief that mathematical models and theories, while useful and successful in describing the physical world, are still human creations that may not fully capture the ultimate truth of reality.
Einstein's views were influenced by his deep engagement with physics and the recognition that scientific knowledge is based on observation, experimentation, and theoretical frameworks. He understood that scientific theories are constantly refined and adjusted as new evidence emerges, and that no theory can claim absolute certainty.
It is worth noting that while Einstein acknowledged the fallibility of scientific knowledge, he strongly believed in the power of rationality, empirical evidence, and the scientific method as the most reliable means of understanding the natural world. He upheld the importance of continually questioning and testing theories, encouraging scientific progress and advancement.