The occurrence to which a response is attached need not always be the complete sufficient cause in the external world. A speaker may present a practical relation while other conditions also influence the result.
Example: «إِنْ قَرَأْتَ الْكِتَابَ فَهِمْتَ الْمَسْأَلَةَ» — If you read the book, you will understand the issue.
Reading supports comprehension, but background knowledge and other factors may matter. The rhetoric here analyzes the linguistic and pragmatic attachment of a result to a condition, rather than offering a complete metaphysics of causation.