@Taken, you assert that Jesus was speaking to the unsaved in Matt. 24:13, but He wasn't addressing people who were or are already unsaved because He didn't say "but he the unsaved who perseveres to the end will be saved". If He was, then He would've said that. Therefore, you not only misunderstand Matt. 24:13, but other verses as well that you think support your OSAS belief. Not every belief can be right.
If you read, learned, believed, trusted, (and Spiritually Understood )the mystery revealed, you would Know and Understand WhO that verse was Speaking TO and WHY it ONLY applied to Them…not the already Saved…not unbelievers.
Even a child can understand, they don’t hope to receive, to keep, what they Already Eternally Have.
You are stubborn…what God called stiffed necked… in the OT and …said to the stubborn in the NT…
Acts. 7:
[51] Ye stiffnecked and uncircumcised in heart and ears, ye do always resist the Holy Ghost: as your fathers did, so do ye.
If you were Saved and Had the Holy Spirit IN you…you would Know…it IS Gods Spirit IN you, Gods Power IN you, that Keeps a man Saved and Nothing would require that man to hope, keep trying, preserver…what that man Has Already accomplished Obeying God exactly what God requires for a man to Be Saved!!
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