The Lord can see how the mind of a person is tending, towards evil or towards good. When the tendency is toward evil the Lord will provide circumstances which allow the person to recognize this and to bend away from that course on his or her own, leaving the person in freedom because he or she is unaware of any actions except his or her own.
In this way a person may turn toward a lesser evil, or even towards good, or - still in freedom - may continue deeper into the evil if that is the strong desire. The Lord’s foresight is in no way a predestination.
(References: Arcana Coelestia 2679, 3854, 3869 [1-14], 5122, 5155, 5195, 6489; Divine Providence 67-73, 333)
