What does Jeremiah 15:19 mean?

Therefore thus saith Jehovah, If thou return, then will I bring thee again, that thou mayest stand before me; and if thou take forth the precious from the vile, thou shalt be as my mouth: they shall return unto thee, but thou shalt not return unto them.

Therefore thus saith the Lord, If thou return, then will I bring thee again, and thou shalt stand before me: and if thou take forth the precious from the vile, thou shalt be as my mouth: let them return unto thee; but return not thou unto them.

Therefore thus saith Jehovah, If thou return, then will I bring thee again, that thou mayest stand before me; and if thou take forth the precious from the vile, thou shalt be as my mouth: they shall return unto thee, but thou shalt not return unto them.

For this cause the Lord has said, If you will come back, then I will again let you take your place before me; and if you give out what is of value and not that which has no value, you will be as my mouth: let them come back to you, but do not go back to them.

Therefore, thus said Jehovah: If thou turnest back, then I bring thee back, Before Me thou dost stand, And if thou bringest out the precious from the vile, As My mouth thou art! They--they turn back unto thee, And thou dost not turn back unto them.

Therefore thus saith the Lord: If thou wilt be converted, I will convert thee, and thou shalt stand before my face; and thou wilt separate the precious from the vile, thou shalt be as my mouth: they shall be turned to thee, and thou shalt not be turned to them.

Therefore thus saith Jehovah: If thou return, then will I bring thee again, thou shalt stand before me; and if thou take forth the precious from the vile, thou shalt be as my mouth. Let them return unto thee; but return not thou unto them.