The keywords in this extract are "and are not striving against it", which is something that those who wish to wallow in their doubt could easily skip over.
Of late I’ve been helped by preaching to understand more, and feel more alarmed about, my “favorite” sins. And still I feel I make little progress! But I am more awake and never want to go back to being placid about them.I will be brutality honest here. With our favorite sins we hardly strive, but give a half hearted attempts all to often. Does this mean we will not see heaven? Of course not, for the half hearted attempts will eventually become striving attempts if The Lord grants us the advantage of growing older.