The Greek word diati is an interrogative conjunction meaning 'why?' or 'for what reason?' — a contraction of dia ti (through/because of what?). It introduces questions seeking the purpose or cause behind an action.
Questions of 'why' in Scripture are not expressions of doubt but of engagement with God. The Psalms are filled with 'why' questions directed at God ('Why, LORD, do you stand far off?' — Ps 10:1). Jesus himself cried from the cross, 'My God, my God, why (diati) have you forsaken me?' (Matthew 27:46) — quoting Psalm 22, an act of deep theological lament that transforms suffering by placing it within the framework of divine address.