Skepticism in the Philosophical system

Skepticism is a condition between belief and non-belief. Doubt is a trait for everybody. But skeptical is not who doubts sometimes, and also is not the person who doubts in practical life, since this doubt is needed for foresight. Skepticism which closes doors of knowledge is criticized and otherwise is not only desirable but also is a bridge to reach the truth and certainty. We tried in this research to explain some types of doubts so as show that by some of these doubts it is possible to reach the certainty.

Doubt, skeptical, knowledge, certainty