The bible clearly teaches that the salvation of the believer is eternal and dependent on Christ alone. Don't be as dumb as a pile of bricks thinking that you can lose your salvation. Mephiboseth sat at the kings table with lame legs, Paul battled the flesh his whole life. Eternal security of the believer is not an excuse to sin but an encouragement to holiness. 1John 3:3 And every man that hath this hope in him purifieth himself, even as he is pure.
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https://www.youtube.com/watch?v=8yn2vDnTCHU
And can it be that I should gain
An int'rest in the Savior's blood?
Died He for me, who caused His pain?
For me, who Him to death pursued?
Amazing love! how can it be
That Thou, my God, should die for me?
Amazing love! how can it be
That Thou, my God, should die for me!
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https://www.youtube.com/watch?v=qec3tVCECVs