When people are healed and delivered it gives us a taste of what conditions are like when Christ has preeminence over all things.
When we speak only to whom we are sent then we will see dramatic results. Trying to speak to everyone in general and no one in particular is a colossal waste of time and demonstrates poor stewardship.
Eternal Life has nothing to do with everlasting existence. Eternal Life is a Person; the Life is the Son; hence, we need only ask if we have received Jesus and we shall know whether we have Eternal Life.
The Law of Life says that the presence of Christ within the believer results in spiritual satisfaction. If we have Him then we will never hunger or thirst again, because He is Infinite Supply.