If you haven't noticed, our Lord makes a distinction between two separate types of sheep; those who belong to Him and those who don't. Those sheep who belong to Him were specifically given to Him by the Father. Then our Lord says that since those sheep were given to Him, He is not going to lose them (the sheep that were given to Him).
While I understand you might believe that a person can lose their salvation, that is not what the scriptures states.
"While I understand you might believe that a person can lose their salvation, that is not what the scriptures states."
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Amen!