“To believe with certainty we must begin with doubting.” ~Stanislaus I of Poland

Doubtful,doubting,creepy

What is that Stanislaus trying to convey ?

He says, to be certain you have to be doubtful !

First of all if you decided  to believe in something ,why should  you be doubtful or apprehensive ? Are you not sure of yourself ?

Is this a contradictory statement or it is a perfect statement ?

Readers please enlighten me further with your thoughts.