Theoretical Sentences Have Their Evidence

Most sentences, apart from observation sentences, are theoretical elet's start with first part of it and say, do we understand his wholism? So theoretical sentences have their evidence, not as single sentences, but only as larger blocks of theory. If you were to say, here's a theoretical sentence, force equals mass times acceleration, the evidence that would count towards that being true is not something that's simply contained in that sentence. And there has to be evidence for all those other sentences as well in order for this particular theoretical sentence to be true or to understand its meaning.