Nothing else is required to pay for our salvation. It has been completed by Jesus.
To be saved, all we must do is believe in the Lord Jesus Christ and His sacrifice for our sins.
If you have questions, there is more about Jesus and our salvation here
Commentary from the In Touch devotional by Charles Stanley, May 18, 2020.
If you answer yes to every question, you can be sure that you are in God’s family and destined for an eternity in His presence. If you answer no, you’ll know exactly which issue(s) to talk over with your pastor or spiritual mentor.
Do I trust Scripture? Salvation is a one-step process: “Believe in the Lord Jesus, and you will be saved” (Acts 16:31). Either we trust that Jesus Christ died for the sins of the world (including ours), or we don’t (John 3:16).
Do I accept the witness of the Holy Spirit? Anyone who believes in Jesus has the Spirit dwelling within his or her being. That is, the Holy Spirit testifies with regard to our identity as God’s children (Romans 8:16). It’s not about whether we feel saved; God’s Spirit offers an abiding conviction that we are.
Do I walk like a follower of Jesus? Those who are in Christ are a new creation (2 Corinthians 5:17). If we have been transformed, then there are going to be changes in our life. Simply put, true believers are creatures who seek the things of God – they desire to read and understand His Word, they want to gather with His people, etc.
Confirmed Christ-followers still sin. Some even backslide for a time. No matter how meandering our walk of faith may be, the Holy Spirit continues to convict. He won’t allow us to be satisfied with wrongdoing. That tug of guilt over sin is yet another assurance that you’ve placed yourself in God’s grip.
Commentary from Charles Stanley’s In Touch Devotional, November 19, 2017.