Until man duplicates a blade of grass, nature can laugh at his so-called scientific knowledge.

Describing something in full detail is a long way from being able to build it. We can name every part of a living thing and still not assemble one, and that gap is a fair measure of how much remains unknown. Confidence tends to run ahead of capability, particularly in fields where the vocabulary is impressive.

None of that is a reason to distrust careful work. It is a reason to hold your own expertise loosely, and to notice the difference between what you can explain and what you could actually reproduce. That distinction keeps a mind curious long after it could have settled.