What logic can and cannot secure

Nazar, Fikr and the Definition of Logic

Studying logic does not make a person infallible. It offers rules for detecting and avoiding errors when applied correctly.
For example, an inference using 'every bird flies' may have a valid conditional pattern, but that universal premise is false; an ostrich cannot fly.
Distinguish the inferential structure from the factual truth of the premises. Reliable conclusions require attention to both.