Why? This is why...
Jhn 10:26
“But you do not believe, because you are not of My sheep, as I said to you.
And no, Jesus is never late for an appointment to salvation, never forgets anyone, never loses His own, for He is the Good Shepherd.
Jhn 10:27
“My sheep hear My voice, and I know them, and they follow Me.
Jhn 10:28
“And I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand.
Jhn 10:29
“My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of My Father’s hand.
Jhn 10:26
“But you do not believe, because you are not of My sheep, as I said to you.
And no, Jesus is never late for an appointment to salvation, never forgets anyone, never loses His own, for He is the Good Shepherd.
Jhn 10:27
“My sheep hear My voice, and I know them, and they follow Me.
Jhn 10:28
“And I give them eternal life, and they shall never perish; neither shall anyone snatch them out of My hand.
Jhn 10:29
“My Father, who has given them to Me, is greater than all; and no one is able to snatch them out of My Father’s hand.
Matthew 18
12What do you think? If a man has a hundred sheep and one of them goes astray, will he not leave the ninety-nine on the hills and go out to search for the one that is lost? 13And if he finds it, truly I tell you, he rejoices more over that one sheep than over the ninety-nine that did not go astray. 14In the same way, your Father in heaven is not willing that any of these little ones should perish.
So there’s context to the verses you supplied. Provided you keep the keep there’s no possibility you can be snatched from God the Father’s hand.