@gloria
For anything nontrivial, Certainty is not even an option let alone a requirement. It indulges the mind’s desire to anticipate and, when occasionally right, reinforces a false sense of control. A “Need for Certainty” can never be entirely fulfilled, it’s a feedback loop, a death spiral of endless rumination. Been there, done that.

Better exercise: Doubt all that can be doubted, see what if anything is left including oneself. Highly recommended.

#Nisargadatta