In order to turn them from darkness to light

Acts 26:17-18
 I will deliver you from the Jewish people, as well as from the Gentiles, to whom I now[a] send you, 18 to open their eyes, in order to turn them from darkness to light, and from the power of Satan to God, that they may receive forgiveness of sins and an inheritance among those who are sanctified by faith in Me.’

A few key concepts of our Lord's mission for us is presented in this few verses. Firstly we need to be delivered from many people who will be against us. But God did not save us from our enemies and take us away. Instead His plan is to bring us back to those who do not believe and to open their eyes to bring them out of darkness.

The other sentence has the two major gifts, that is the forgiveness of our sins and the sanctification by faith in Christ. The forgiveness of sins is somethings which is given and cannot be earned. The sanctification process itself, will involve the Lord and we also cannot achieve this by ourselves.