Trzy strategie dyskusji ze sceptycyzmem

In debate with scepticism three general strategies may be differentiated: (1) pointing to self-refutation of scepticism; (2) looking for certainty; and (3) modification of the concept of knowledge. The latter strategy has at least three versions: (a) knowledge does not require certainty, (b) knowledge is not broadened by way of deduction, and (c) knowledge does not require the knowledge of knowledge. The first strategy refutes global scepticism, but does not give an example of knowledge and is not efficient in the case of scepticism based on the hypothesis of the malicious scientist. Also the second strategy is only able to refute the typical thesis of global scepticism (knowledge does not exist). Scepticism based on the hypothesis of the malicious scientist is more efficiently refuted in the third strategy. However, separation of knowledge and certainty is only avoiding the problem of scepticism. It is also doubtful if the principle of broadening knowledge by way of deduction may be refuted. Negation of the principle of transparency of knowledge is the most convincing one. After it is refuted, knowledge is possible in the situation when we do not know if we know and we cannot exclude sceptical hypotheses.