When does “Time is a trust” illustrate ījāz al-qaṣr rather than ellipsis?

Supplementary Practice 10: Rhetoric of Claim, Evidence, Objection and Reply

• When a relative pronoun is necessarily omitted
• When compact wording evokes wider implications without requiring an identifiable omission
• When it must always be the predicate of kāna
• When it conveys no broader implication