The philosophical concept that humans may never know the absolute truth about anything is called "agnosticism."
Agnosticism is a view that holds that certain ultimate questions, such as the existence of God, the nature of reality, or the afterlife, are inherently unknowable or beyond the scope of human understanding. Agnostics believe that it is not possible for human beings to have absolute certainty or knowledge about these matters.
The term "agnostic" was coined by the English biologist Thomas Henry Huxley in the 19th century, and it is derived from the Greek word "agnostos," which means "unknown" or "unknowable."
Agnosticism should be distinguished from atheism, which is the lack of belief in gods or deities, and from theism, which is the belief in the existence of one or more gods. Agnostics take a more skeptical stance, asserting that the ultimate answers to metaphysical questions are beyond human grasp, and therefore, they withhold judgment on matters that transcend empirical observation and evidence.