Why is it necessary for all those who will be saved to be "turned around" and "turned back"?

1. National

And God saw their works, that they turned from their evil way; and God repented of the evil, that He had said that He would do unto them; and He did it not.

- Jonah 3:10

2. Church

Now when all this was finished, all Israel that were present went out to the cities of Judah, and brake the images in pieces, and cut down the groves, and threw down the high places and the altars out of all Judah and Benjamin, in Ephraim also and Manasseh, until they had utterly destroyed them all. Then all the children of Israel returned, every man to his possession, into their own cities.

- II Chronicles 31:1

3.

Personal

a. Outward

But Peter said, Ananias, why hath Satan filled thine heart to lie to the Holy Ghost, and to keep back part of the price of the land?

- Acts 5:3

b. Temporary

For Demas hath forsaken me, having loved this present world, and is departed unto Thessalonica.

- II Timothy 4:10a

c. Saving

And Philip said, If thou believest with all thine heart, thou mayest. And he answered and said, I believe that Jesus Christ is the Son of God.

- Acts 8:37

d. Repeated
(After backsliding)

And the Lord said, Simon, Simon, behold, Satan hath desired to have you, that he may sift you as wheat:

But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren.

- Luke 22:31-32

e. Daily
(In the life of sanctification)

And it came to pass, as she spake to Joseph day by day, that he hearkened not unto her, to lie by her, or to be with her.

- Genesis 39:10