Tawshīʿ (التوشيع) first presents something as a group or numbered whole and then unfolds its parts. The audience anticipates what the items will be.
The source cites the statement «يَشِيبُ ابْنُ آدَمَ وَيَشِبُّ فِيهِ خَصْلَتَانِ»—a human ages while two qualities remain youthful—followed by greed (الحرص) and extended hopes (طول الأمل).
By first saying “two qualities” and then naming them, the expression creates expectation and makes the teaching more memorable. The additional detail serves a clear communicative function.