I endeavor to always discern who's ready to receive based on recognizing the presence of the Spirit's power or on recognizing those who are humble and receiving the message. Over the years, I've noticed that some ministers don't like this type of approach because they think I'm rejecting some people. Christians that do this will sometimes site Luke 10 where Jesus sends out 72 disciples with power to heal the sick and cast out demons. Those 72 disciples returned with joy because they had great success healing people and casting out demons. The insinuation by those who teach this is that everyone received, but that's not true. A closer look at the whole context of Luke 10 shows us that the disciples ministered to those who welcomed them. Those who were proud were warned of destruction.
“When you enter a town and are welcomed, eat what is offered to you. Heal the sick who are there and tell them, ‘The kingdom of God has come near to you.’ But when you enter a town and are not welcomed, go into its streets and say, ‘Even the dust of your town we wipe from our feet as a warning to you. Yet be sure of this: The kingdom of God has come near.’ I tell you, it will be more bearable on that day for Sodom than for that town. - Luke 10:8-12