Believers belong to the Lord and not to themselves, and that is why they are secure. An owner is responsible for his own possessions, so it is impossible for a true believer ever to be lost. However, a TRUE believer will never return to a sinful former lifestyle and STAY in that condition since the Holy Spirit now indwells him. "Quickie conversions" reap quick dropouts, but true belief endures to the end. Don't be deceived by satan's copycats. Read 1 John 2:3-8.
Matthew 10:7-10 As you go, proclaim this message: ‘The kingdom of heaven has come near.’ Heal the sick, raise the dead, cleanse those who have leprosy, drive out demons. Freely you have received; freely give. Do not get any gold or silver or copper to take with you in your belts— no bag for the journey or extra shirt or sandals or a staff, for the worker is worth his keep.
Are not two sparrows sold for a penny? and not one of them shall fall on the ground without your Father: but the very hairs of your head are all numbered. Fear not therefore: ye are of more value than many sparrows. Matthew 10:29-31