No Christian can ever be a successful person of prayer if he allows un-confessed sin to remain hi his life. We all remember that it was sin which caused all the trouble in the beginning. And it is still sin hat stunts and wrecks the effectiveness of our Christian life and testimony.
God our Father cannot answer our petitions if we play with sin or condone its presence. This is absolutely ruinous to our relationship to God. Rather than sending His blessings upon us, He must send punishment until we repent and confess. Christians must sincerely hate sin – hate it enough o conclusively turn from it. Then we may pray.