The expression إدراكات جزئية points to assessing particular utterances by means of general principles. One need not invent a separate rule for each sentence; one learns how the relevant circumstance affects its form.
For example:
زَيْدٌ حَاضِرٌ — Zayd is present.
إِنَّ زَيْدًا حَاضِرٌ — Indeed, Zayd is present.
Both are grammatical. In a discussion where Zayd's presence is disputed, the latter may be more appropriate. Identifying that change in a particular situation is applied maʿani.