This blog posting by Kevin Jackson does a good job in attempting to explain God’s grace—something that I believe we can understand to a point, but never fully comprehend in this life. Below is an excerpt:
“Prevenient grace is grace that God gives to begin the process of drawing a person to Himself. Its purpose is to prepare the heart of the non believer to respond to the good news of salvation in Jesus Christ. Because of the sinful nature, no person seeks after God on his own. The Holy Spirit convicts a person of sin, shows him his need for the Savior, and urges the person to repent. […]”
And more importantly, he provides Biblical support.
Incidentally, based on my studies of the Scriptures, I have believed in prevenient grace for a long time. I saw it in the Bible before I knew what it was called and before I knew what Armininanism really taught—back when I thought Arminians were heretics (I now know better). As with every other issue, I encourage folks to put aside their preconceived ideas and look at what the Bible teaches. Study the Word and trust the Holy Spirit to point you in the right direction!
“However, when He, the Spirit of truth, has come, He will guide you into all truth […]” (John 16:13, NKJV, emphasis added).