The source analyzes “Zayd is standing” through three required apprehensions:
1. Conception of Zayd: the subject under discussion.
2. Conception of standing: the predicate attributed to him.
3. Conception of the link: the meaning connecting subject and predicate.
The mind then judges whether this connection obtains.
The idea of a relation differs from affirming that it really holds. A listener may understand what “Zayd is standing” claims without assenting to it.