They also make it into a good work, and write hymns about the decision they made. What Paul has in mind is quite different. I am saved because I know the Holy Spirit is working in me and for me. My eternal security is not based on understanding a payment Jesus made in the past, or a decision I made to accept it, but on what the Holy Spirit is doing now. Once the Holy Spirit has begun to work in us, though we are still very imperfect, we have the certain hope that the Father, the Son, and the Holy Spirit will continue the perfecting which has begun.
Some people think that changing one's mind is a sign of instability.
Better remain stuck in the traditional mud. I find that those who were most thoroughly drilled into patterns of thinking as children are also those who find it very hard to change into more creative models later. Most Sunday School materials for example reduce Christian faith to moralizing, be kind, love minorities, avoid sex, and help mum with the dishes. God has to use pretty violent means to force them later to change their mind to be open to the Holy Spirit. I then try that on for size, adopt it if it seems to work, check it out with others, and then be ready for further unexpected change.