“My father which gaue them me, is greater then all: and no man is able to plucke them out of my fathers hand.”
1611 King James Version (KJV)
Joh 10:29 No [man] is able to pluck [them] out of my Father's hand. The sheep who hear his voice and follow him (Joh 10:27). This is the condition of their safety. If they comply with it God's grace will save them from the adversary.