The Holy Spirit convicts a believer of sin and God adds those that He wills to the church (Acts 2:47), so what part do we play in reaching the lost? God could prepare a Damascus Road experience (Acts Chapter Nine, where Jesus Himself appears to Saul of Tarsus) for every unsaved person if He chose to--our triune God is certinly omnipresent! Instead, the Apostle Paul tells the Corinthians, "it pleased God through the foolishness of the message preached to save those who believe." (I Corinthians 1:21, NKJV). The NLT puts it this way: :"Since God in his wisdom saw to it that the world would never know him through human wisdom, he has used our foolish preaching to save those who believe." Our message of repentance and profession of faith is indeed a simple one in the eyes of the wordly wise!!
However, we know that there are components of an effective witness, and one must wait on the Lord for the opportunity to speak and the particular person to speak or preach to. We must pray and study the Bible, because the Gospel is presented throughout.
Ezekiel had a seven day waiting period before received his message, including a vsion of the beings, after the Spirit lifted him up. Note Ezekiel 3:14: