The process is always the same.
The individual has a stock of old opinions already.
The individual meets a new experience that puts some of these old opinions to a strain.
The result is inward trouble, to which the individual's mind till then had been a stranger.
The individual seeks to escape from this inward trouble by modifying the old opinions.
Finally, some new opinion comes up which the individual can graft upon the ancient stock of old opinions with a minimum of disturbance to the others.
The new opinion is then adapted as the true one.
The most violent revolutions in an individual's beliefs leave most of his old order standing.
New truth is always a go-between, a smoother-over of transitions.
The point I now urge you to observe particularly is the part played by the older truths . . . their influence is absolutely controlling. Loyalty to them is the first principle; for by far the most usual way of handling phenomena so novel that they would make for a serious rearrangement of our preconceptions is to ignore them altogether, or to abuse those who bear witness for them.