If you read through my post you will find me agreeing with your not knowing. I have stated to one of you that the one who claims his election cannot even be sure because he cannot find one promise from God that he is. You must have God saying you are elect or there is a possibility that you are deceived into thinking you are elect when you are not.
The ambiguities in such a question prevent people from saying much meaningful in answer to it.
It baffles me why you'd say that no one can know
himself, because that's actually repeated in Scripture.
No, in all these things we are more than conquerors through him who loved us. For I am sure that neither death nor life, nor angels nor rulers, nor things present nor things to come, nor powers, nor height nor depth, nor anything else in all creation, will be able to separate us from the love of God in Christ Jesus our Lord. Rom 8:37-39
And by this we know that we have come to know him, if we keep his commandments. Whoever says "I know him" but does not keep his commandments is a liar, and the truth is not in him, but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him: whoever says he abides in him ought to walk in the same way in which he walked. 1 Jn 2:3-6
Whoever believes in the Son of God has the testimony in himself. Whoever does not believe God has made him a liar, because he has not believed in the testimony that God has borne concerning his Son. And this is the testimony, that God gave us eternal life, and this life is in his Son. Whoever has the Son has life; whoever does not have the Son of God does not have life. I write these things to you who believe in the name of the Son of God that you may know that you have eternal life. 1 Jn 5:10-13
You must not trust your heart. The word of God is the only thing that is sure!
If your heart is indwelt by the Spirit of the God of the Universe?
But a Jew is one inwardly, and circumcision is a matter of the heart, by the Spirit, not by the letter. His praise is not from man but from God. Rom 2:29
My flesh and my heart may fail, but God is the strength of my heart and my portion forever. Ps 73:26
By this we shall know that we are of the truth and reassure our heart before him; for whenever our heart condemns us, God is greater than our heart, and he knows everything. Beloved, if our heart does not condemn us, we have confidence before God; and whatever we ask we receive from him, because we keep his commandments and do what pleases him. And this is his commandment, that we believe in the name of his Son Jesus Christ and love one another, just as he has commanded us. Whoever keeps his commandments abides in God, and God in him. And by this we know that he abides in us, by the Spirit whom he has given us. 1 Jn 3:19-24
There are various other errors in your posting, which I'll leave to another time.