Wrong...salvation means to be free of sin and Jesus told us to be. He told Mary to go and sin no more, obviously that means we all can. He did not tell her to go and not sin a particular sin no more, or try your best. It was a direct command because he saw that she loved him and then would be able to follow that.
Rom ch7
14
For we know that the law is spiritual: but I am carnal, sold under sin.
15
For that which I do I allow not: for what I would, that do I not; but what I hate, that do I.
16
If then I do that which I would not, I consent unto the law that it is good.
17
Now then it is no more I that do it, but sin that dwelleth in me.
18
For I know that in me (that is, in my flesh,) dwelleth no good thing: for to will is present with me; but how to perform that which is good I find not.
19
For the good that I would I do not: but the evil which I would not, that I do.
20
Now if I do that I would not, it is no more I that do it, but sin that dwelleth in me.
cor 15:50
Now this I say, brethren, that flesh and blood cannot inherit the kingdom of God; neither doth corruption inherit incorruption.
52
In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.