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You cannot get obtain or keep salvation through works, why their works were not good enough. You have to repent and accept Jesus as your savior.

If you doubt your salvation , fear you will lose your salvation, worry you are not doing enough, you are sinning. Doubt, fear, and worry are sins.

Whosoever should believe on him, not keep believing on him, but once believe on him, shall have eternal life. What you should to do with that gift will result in eternal rewards.

Whosoever should believe on him, not keep believing on him, but once believe on him, shall have eternal life.

No; that teaching is not found in the scriptures.

Moreover, brethren, I would not that ye should be ignorant, how that all our fathers were under the cloud, and all passed through the sea;
And were all baptized unto Moses in the cloud and in the sea;
And did all eat the same spiritual meat;
And did all drink the same spiritual drink: for they drank of that spiritual Rock that followed them: and that Rock was Christ.
But with many of them God was not well pleased: for they were overthrown in the wilderness.
Now these things were our examples, to the intent we should not lust after evil things, as they also lusted.
Neither be ye idolaters, as were some of them; as it is written, The people sat down to eat and drink, and rose up to play.
Neither let us commit fornication, as some of them committed, and fell in one day three and twenty thousand.
Neither let us tempt Christ, as some of them also tempted, and were destroyed of serpents.
Neither murmur ye, as some of them also murmured, and were destroyed of the destroyer.
Now all these things happened unto them for ensamples: and they are written for our admonition, upon whom the ends of the world are come.
Wherefore let him that thinketh he standeth take heed lest he fall.

First Corinthians, Catholic chapter ten, Protestant verses one to twelve,
as authorized, but not authored, by King James