“My heart desires one thing and my reason another” distinguishes inner faculties, but the mere mention of two faculties does not satisfy the definition of tajrīd. The construction must draw another counterpart possessing the same relevant quality from the original bearer.
Likewise, “there are two personalities within me” can be psychological description, analogy, or figurative language rather than automatically tajrīd.
Diagnostic test: Identify the source, the extracted counterpart, and the shared characteristic. Without these, the presence of words such as “another” or “a second self” is insufficient.