From principles is derived probability but truth or certainty is obtained only from facts
Certainty is the feeling that something will happen without doubt, and it can provide hope and joy or fear and despair. In life few things are certain except for death, because every living creature can be certain that they will die at some point. Certainty about negative things can cause people to freeze up or fail to act though, while certainty about positive things can give determination and a will to keep going.