Should one who is afflicted with "waswasa" (insinuating thoughts/compulsive urges) ignore them, even if he feels certain?

A person afflicted with obsessive thoughts (waswasa) should disregard them and pay them no mind, until they attain certain and firm conviction contrary to these obsessive thoughts. The criterion for this conviction is that one should be able to swear an oath concerning it. If one reaches this degree, then the implication of this conviction becomes binding upon them. Without this conviction, one should disregard doubts and not pay attention to them.