That was made in 1934, in an article entitled "Radio Power Will Revolutionize the World" published in Modern Mechanics and Inventions (July 1934).
"Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality."
Although the quote was made nearly 3 quarters of a century ago, it is still eminently applicable to the world we are in today! The "Today" Tesla referred to in 1934 is practically the same thing we are facing today! I am not certain if they have any notion about the computer in 1934. Nevertheless the leading "scientists" then and now, I believe, are equally capable of working out of their self-indulged elite cocoons -- "which has no relation to reality"! People call Tesla "The genius who lit the world." I think he is more than just a genius. He is a timeless genius! His quote aptly described the essence of today's scientific world so much so that I doubt anyone can ever come up with a better description.