In 1984 (part 3 - chapters 4-6), what does Winston think of his few remaining contrary flashbacks?

In chapter four of Book three Orwell
writes,

"He
remembered remembering contrary things, but those were false memories, products of
self-deception."

This proves
that he knew these thoughts he had previously had that went against
the Party's teachings were untrue. (Although we audience members know they are true
because we have just seen Winston transform before us.) He acknowledges that accepting
the Party's principles was much
easier.

In fact, as the storyline
continues, he begins to embrace more fallacies as truth. He becomes taken with the idea
that all happenings take place in the mind, and to be fully participative in the Party,
he had to learn to control these flashbacks. He therefore developed an ability to block
thoughts that could dangerously influence him. This new reflex he developed is called
Crimestop.