Jesus is God made visible...and the flesh counts for NOTHING.
You will have to struggle with Jesus saying the flesh counts for nothing.
Maybe after you are done struggling, you will come to know that Jesus is God the Father come in the flesh.
Indeed, Jesus' life by doing the will of the Father always showed the heart of God but God is invisible, Jesus, being flesh and blood is not invisible. God is invisible, Jesus was seen by thousands, this difference alone proves beyond any doubt, that God and Jesus are not identical.
John 6:63
It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.
So Jesus dying, his flesh dying
?
What was Jesus referring to in your passage?
Was he saying that his flesh, his body and soul, dying was useless?
or that the carnal knowledge obtained by the flesh, the five senses was worthless?
That we need to align our lives and thinking with spiritual knowledge and wisdom that come from God's word?