Gospel in New Testament

In the fullness of time
The Law was a tutor (Gal. 3:24) which pointed people to the realisation that they need a Saviour. In the fullness of time the promised Saviour, Jesus, was born into the world. Instead of living by the Law’s rules, we are now given the opportunity to simply come to God by means of His grace, through Jesus. All we need to do is to put our faith in Christ as Lord and seek His forgiveness by repenting of our sin.
Why is Jesus’ death significant?
Jesus, being both God and a sinless man (1 Peter 2:22) was the only one whose death could once and for all cleanse people from their sin (Heb. 10:4). On the cross He took the punishment that we deserved (substitutionary atonement) and appeased God’s wrath (1 John 2:2). If Jesus had not done this we would still be hopelessly lost, living under the Law instead of Grace
Why is Jesus’ resurrection significant?
Jesus’ resurrection defeated death and destroyed the works and power of Satan (1 John 3:8). Only God could do such a thing. Jesus is the firstfruit of the resurrection (1 Cor. 15:20-23), meaning that all humanity will also one day be resurrected after death, just like Jesus was. Believers will be raised to eternal life with Christ and unbelievers raised to eternal punishment (Matt. 10:28).