"Then spake Jesus again unto them, saying, I am the light of the world: he that followeth me shall not walk in darkness, but shall have the light of life." -- John 8:12 "Be not afraid, only believe." -- Mark 5:36"Verily, verily, I say unto you, He that heareth my word, and believeth on him that sent me, hath everlasting life, and shall not come into condemnation; but is passed from death unto life." -- John 5:24
Of course Jesus was very clear. He talks about obeying God and having faith in Him. However, Jesus doesn't give an indication of who is a member of the flock based on past performance or past belief. In your three verses, please note that they are in the present tense. We know we are saved NOW. We know He abides in us NOW. And as long as we persevere, we WILL be saved. However, believing last week is pointless if you don't believe today. Obeying God last week and willfully sinning today is a problem.
That was my point. I wanted to point out the importance of perseverance over presumption.
Regards