Joel Feinberg and Russ Shafer-Landau note that "using the scientific method to judge the scientific method is circular reasoning". Scientists attempt to discover the laws of nature and to predict what will happen in the future, based on those laws. However, per David Hume's problem of induction, science cannot be proven inductively by empirical evidence, and thus science cannot be proven scientifically. An appeal to a [i]principle of the uniformity of nature[/i] would be required to deductively necessitate the continued accuracy of predictions based on laws that have only succeeded in generalizing past observations. But as observed, "The method of 'postulating' what we want has many advantages; they are the same as the advantages of theft over honest toil".
Source: https://en.wikipedia.org/wiki/Circular_reasoning
Source: https://en.wikipedia.org/wiki/Circular_reasoning