The initial incommunicability of truth, scientiﬁc or otherwise, shows that we think in grooves, and that it is painful for us to be torn away from the womblike security of accepted concepts.
Reynolds, William C. Perkins, Harry C. Concepts form the basis for any science. These are ideas, usually somewhat vague (especially when ﬁrst encountered), which often defy really adequate deﬁnition. The meaning of a new concept can seldom be grasped from reading a one-paragraph discussion. There must be time to become accustomed to the concept, to interrogate it with prior knowledge, and to associate it with personal experience. Inability to work with details of a new subject can often be traced to inadequate understanding of its basic concepts.