Things of the Spirit (pneumatikos) are anything but certain. According to Christ, it takes faith to cast out demons, heal the sick, and move mountains. In the realm of things the Spirit inspires, there is a gap between what is and what could be that only faith can fill. If we are not willing to strike out in faith on the basis of an inspiration, call it a holy hunch, we will never experience the kinds of supernatural things that are mentioned throughout the New Testament.
Substituting our judgment for the Holy Spirit's is not prudence or wisdom, nor is it faithful--what it is, is a surefire way to quench the Holy Spirit and live a life without the miraculous.
It is a misapprehension to think that a lightning bolt from heaven would strike (or something nigh unto it) if you were meant to heal the sick, or speak a prophetic word, or exercise power against an unclean spirit. Not many, if any, of us are ever going to experience anything like that! Jesus didn't experience that, Peter didn't experience that, and Paul didn't experience that. Elijah learned the hard way not to expect to.
We need sensitivity to the intimate voice of God within us to catch the stirring of the Spirit.
When God's whisper falls on our "ear", we have to act in faith or we'll miss the opportunity to do a greater work. If that happens, something Jesus went to the cross and ascended into heaven to make possible ends up being missed entirely. We are not meant to live satisfied with the Cessationist's paltry gospel, which is little more than an academic exercise in criticism, history and philosophy that devolves into endless debates over the meanings of words. What we are called to be is powerful witnesses of Christ to the world after that the Holy Spirit comes upon us.
The Holy Spirit has a way of making himself heard to the hearing ear. To those that have one, much more will be given. To those who turn a deaf ear to God the Spirit, what could have been theirs is lost, like a fruitful field of grain that went unharvested. We're partnered with God, someone we can absolutely trust. When that hunch that might be the Holy Spirit stirs within, we must take faith in hand and act or we'll lose the opportunity.
James Bond, despite his iconic instruction concerning his taste in spirits, would be dead wrong in the realm of the Spirit: it's always better to be stirred, not shaken.