John Tyndall Quote

Thus, having exhausted science and reached its very rim, the real mystery of existence still looms around us. And thus it will ever loom - ever beyond the bourne of man's intellect - giving the poets of successive ages just occasion to declare that, We are such stuff As dreams are made of, and our little life Is rounded by a sleep.

Heat a Mode of Motion (6th edition), Lecture XVII (p. 535)