Jesus is speaking these words to His disciples. Not to pray is wicked. The life of Christ which is given to us seeks after God. As the plant in your house will always turn its leaves to the sun no matter where you position it, so prayer to the Christian. We must look unto God from whence cometh our help.
Prayer is necessary as worship.
I am not asking you now if your prayer-life is what it should be. I am not asking you whether or not you are able to bring forth a fluent prayer. I am not even asking you right now if your prayer-life is regular. When we are prayerless we are not only weak and subject to temptations and to falling into sin. When we are prayerless, we are sinning.