«القلب: وهو نوعان»
Qalb has two forms.
In one, the opponent reworks the proposed cause and ruling so that their argumentative roles reverse. The book illustrates this through a dispute over the timing of the obligation of fitr charity.
In the second, the opponent uses the proponent’s alleged cause to argue for the contrary ruling. The text applies it to the specification of intention in fasting and make-up fasting.
The purpose is to reveal a reversal in the inference, not to settle every juristic dispute discussed in the examples.