'This fasting...is very good, provided the commandments of the Lord be observed...First of all, be on your guard against every evil word, and every evil desire, and purify your heart from all the vanities of this world. If you guard against these things, your fasting will be perfect.' - The Shepherd of Hermas
I believe David Wilkerson is a true prophet of God. Maybe he is not recognized as such. Neither were some of the Israel prophets but they were sent by God as prophets notwithstanding. This is God's hour for heeding this great preacher of righteousness in our generation.