Contradiction between physical weakness and spiritual rebellion

أَوَلَمْ يَرَ ٱلْإِنسَـٰنُ أَنَّا خَلَقْنَـٰهُ مِن نُّطْفَةٍ فَإِذَا هُوَ خَصِيمٌ مُّبِينٌ

Does man not consider that We created him from a [mere] sperm-drop - then at once he is a clear adversary?