From the pen of Joni Eareckson Tada...
I love the painting of Jesus standing at a door with a lamp in one hand and gently knocking with the other. When you look closely, you see there is no doorknob. The suggestion is that the door can only be opened from the inside, placing the responsibility of salvation on the person behind the door. It's a lovely painting inspired by Revelation 3:20 (which is actually an invitation of fellowship to believers, not an invitation of salvation to unbelievers).
The true picture of salvation is that we are utterly dead in our sin. We are spiritually deaf and cannot even hear Jesus knocking. A more accurate picture might be Jesus rapping on the door, climbing over it, and then placing our lifeless hand on the inside doorknob! Jesus is the One who gives us faith to believe (Romans 12:3). He unplugs our ears, opens our eyes, touches our hearts, illumines our thinking, and places within us the saving faith to say, "I believe!"
"Pearls of Great Price," December 18 devotional