We must believe that all the sciences are so interconnected, that it is much easier to study them all together than to isolate one from all the others. If, therefore, anyone wishes to search out the truth of things in serious earnest, he ought not to select one special science; for all the sciences are cojoined with each other and interdependent..

In: Great Books of the Western World (Volume 31), Rules for the Direction of the Mind, Rule 1 (p. 1)