The Holy Spirit comes as an extension of our common sense because sometimes your common sense will tell you, “this is okay” but the Bible says “…there is a way that seemeth right to a man (i.e. to our common sense) but the end of it is perdition.” Only the Holy Spirit can give us the knowledge of the end of a road, the course of an action, choice or decision.
Sometimes we have to make life changing decisions like the choice of who to marry. It is a risk, no doubt, but it is a safe risk if the Holy Spirit is involved in your choice. However, if the Holy Spirit is not involved, it is not safe. Only God knows the man or woman that will do you good; our senses have their own desires and tastes but when dealing with human beings, you need the help of the Holy Spirit.
The Holy Spirit comes in when we enter the supernatural zones of life where the knowledge and ability of man becomes inadequate or irrelevant in dealing with what we face. Supernatural zones point to the supernatural world that predates and controls the physical world we see. These are the God-zones of life. Make sure you never enter those zones of life without your helper, the Holy Spirit.
Many Christians do not use all the resources available to them in the omniscience of the Holy Spirit and you must not be such a Christian. Developing your sensitivity to the Holy Spirit pays eternal dividends.