Willful ignorance is the person with heart disease who says cholesterol is not harmful to their heart. Willful ignorance is the couple whose marriage is headed for the rocks and they refuse to get help. Willful ignorance is the person who ignores Jesus because He isn't cool. Don't let the darkness of wilful ignorance rob you of the light of life. The darkness stands for life without Christ, and especially for the person who refuses Christ's forgiveness.
Winners exchange the ignorance of darkness for enlightenment.
Winning is sure because the light of Jesus cannot be put out. To extinguish can mean the darkness pursued the light but never overcame it. The darkness does everything possible to eliminate Jesus Christ, even to crucifying him, but it could never destroy him. To extinguish can be used of putting out a fire or flame. That is the sense in which this message takes it.