Provability-Unprovability

You can prove almost anything with the evidence of a small enough segment of time. How often, in any search for truth, the answer of the minute is positive, the answer of the hour qualified, the answers of the year contradictory. (Teale)

You cannot demonstrate an emotion or prove an aspiration. (Morley)

We can prove whatever we want to, and the real difficulty is to know what we want to prove. (Alain)