Thinking good thoughts is probably helpful, but certainly not the kind of force I am describing. The depth of psychological change I am referring to here cannot happen at an occasion. The battle has to be renewed every day – twice a day if one is going to be serious – and go on the rest of our life. It has little to do with pleasant thoughts or indeed any thoughts, and many daunting ancillary disciplines have to be added to sustain this practice and realize its full effects.

Science advances through a succession of paradigms, or frames of reference, which are often mutually irreconcilable. Without a definite shift in our educational perspective, we can hardly hope to effect a permanent shift in our worldview.