William Ramsay Quote

But I am leaving the regions of fact, which are difficult to penetrate, but which bring in their train rich rewards, and entering the regions of speculation, where many roads lie open, but where a few lead to a definite goal.

Speculating on the nature of radioactive emanations, in his Nobel lecture, December 12, 1904.

Sir William Ramsay - Nobel Lecture: The Rare Gases of the Atmosphere