I think he actually had a good point.
I've been to some Reformed Churches where the sermon touched on the issue of being guided by God. The Bible was held up, and we were told that the ONLY way God would do any guiding in our lives was through studying the Holy Scriptures.
But such a religious instruction only gives death and quenches our openness to the other ways God can lead us.
All scripture is essential to our Christian walk, but it isn't the
only means God will ever use to guide us. God might say to us, "Go!", and where we are going and what we will be doing may not be specifically contained in the Bible, but will of course correspond with the principles of Scripture. The Bible isn't the third member of trinity - but it is a means towards receiving Him and His guidance! And scripture can't itself be understood apart from the power of the Holy Spirit.
I know you know all of this, and that I'm being Captain Obvious here, but just for balance - Jesus is recorded as saying in John's Gospel that the Spirit will lead us to all truth. In his epistles, Paul constantly exhorts believers to keep in step with the Spirit. In Acts, we see examples of the Holy Spirit giving very specific directions and instructions to believers in how they are to spread the Good News. Then there are the Spiritual Gifts, especially prophecy and words of knowledge, which God will use to lead us - either directly in us, or through a brother or sister who has a word from the Lord for us. There is the counsel of fellow believers, there are dreams and visions, and there are hopes and dreams specific to the modern world we live in that God has placed in our hearts. Are we called to fight against child trafficking? Are we to work with drug addicts? Is our primary ministry in youth work or in caring for the elderly? Are we called to go to a land that has never been reached by Christians? Should we give up our job to pursue full time ministry, or is our calling within our work place?
Please don't think I undervalue scripture. I have been increasingly grateful to God for the Bible as I mature in the faith - what a privilege to hold in our hands the precious letters Paul sent to his beloved churches, the inspired works of the prophets, the sayings of Jesus, the revelations of Daniel and John, and the wisdom of Solomon. How lucky I am to be reading all these inspired writings, and how wonderful it is how God preserved them through burnings, attempted corruptions, forgeries, and all a manner of other human evils. But to say that experience is inferior to Scripture is dangerous, just as it is to claim that it is superior. Full obedience to God's plan for our lives can only come about if we experience the leading of His Holy Spirit, if we are carried by an experience His presence, His joy and His hope, and if in all of this we are always turning to Scripture to learn the attributes of God and to ensure we are really being lead by Him.