H e did not need anyone to tell Him about man. He knew what was in man.
وَلَمْ يَكُنْ يَحتاجُ أنْ يُخبِرَهُ أحَدٌ عَنِ النّاسِ، لِأنَّهُ كانَ يَعلَمُ ما فِي داخِلِ النّاسِ.