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The necessity of faith as an ingredient in our mental attitude is strongly insisted on by the scientific philosophers of the present day; but by a singularly arbitrary caprice they say that it is only legitimate when used in the interests of one particular proposition, - the proposition, namely, that the course of nature is uniform. That nature will follow to-morrow the same laws that she follows to-day is, they all admit, a truth which no man can know; but in the interests of cognition as well as of action we must postulate or assume it.

William James#11

PhilosophyFaithScienceNatureMethodology

About this quote

What does it mean?
The speaker argues that scientific philosophers demand faith in uniform nature, even though it cannot be proven.
In plain terms
Science assumes nature’s laws stay the same, despite uncertainty.
What can you take from it?
We must postulate consistency to act and think.

Where it applies

  • theoretical physics
  • daily planning

Putting it to work

  • recognize provisional assumptions
  • test consistency where possible

Questions to consider

  • Why do we need this assumption?
  • What happens if nature changes?

Another view

Faith in uniformity can be challenged by paradigm shifts.

More from William James

  1. Every way of classifying a thing is but a way of handling it for some particular purpose.

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  2. Pretend what we may, the whole man within us is at work when we form our philosophical opinions. Intellect, will, taste, and passion co-operate just as they do…

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  3. Romeo wants Juliet as the filings want the magnet; and if no obstacles intervene he moves towards her by as straight a line as they. But Romeo and Juliet, if a…

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