In the first reading, Paul tells us that the Spirit of God searches the very depths of God. This means that the Spirit reveals to us the hidden things of God that the worldly eye we usually have, cannot see.
Using the light of the Spirit to understand the gospel, we see that the evil spirits recognised Jesus for who he was, they feared and yet obeyed him. Jesus is the Holy One of God and to appreciate this truth we need the Spirit. The Jewish people were confused. Some recognised him as in this story, while others rejected Jesus.
The Deranged Man in the Capernaum Synagogue
It' the same with us, sometimes we recognise him, other times we cannot see him because we are caught up in the cares of the world, and the worries of life.
So many things block us off from the Spirit of God within us. It is called sin; we all understand mortal sin but fear, self concern and lack of trust effecting our thoughts also blocks us from God's Spirit of love, joy, peace, patience, kindness, goodness, trustfulness,