As regards its generic features, this spiritual attitude or theory of life is in the last analysis reducible to terms of a prevalent type of character.
The situation of today shapes the institutions of tomorrow through a selective, coercive process, by acting upon men's habitual view of things, and so altering or fortifying a point of view or a mental attitude banded down from the past.

The institutions--that is to say the habits of thought--under the guidance of which men live are in this way received from an earlier time; more or less remotely earlier, but in any event they have been elaborated in and received from the past.
Institutions are products of the past process, are adapted to past circumstances, and are therefore never in full accord with the requirements of the present.

In the nature of the case, this process of selective adaptation can never catch up with the progressively changing situation in which the community finds itself at any given time; for the environment, the situation, the exigencies of life which enforce the adaptation and exercise the selection, change from day to day; and each successive situation of the community in its turn tends to obsolescence as soon as it has been established.

When a step in the development has been taken, this step itself constitutes a change of situation which requires a new adaptation; it becomes the point of departure for a new step in the adjustment, and so on interminably.
It is to be noted then, although it may be a tedious truism, that the institutions of today--the present accepted scheme of life--do not entirely fit the situation of today.

At the same time, men's present habits of thought tend to persist indefinitely, except as circumstances enforce a change.