Medical advice, informed estimates, and expert guidance are not claims to possess the unseen. They rely on evidence and acknowledge uncertainty. A person’s assertion that they can know destiny or hidden secrets with certainty, without valid means, is fundamentally different.
Example 1: A doctor uses symptoms and tests to suggest treatment: that is reasoning from available evidence.
Example 2: Someone claims guaranteed knowledge of a person’s fate, marriage, or death through secret mystical signs; that is the kind of claim one must avoid treating as certain.
Even though لَمْ تُقْبَلْ لَهُ صَلَاةٌ is a stern warning, it never instructs someone to stop worshipping. Repentance, abandoning the wrong practice, and maintaining prayer remain necessary.