It is possible for the conscious and subconscious minds to disagree, or accept conflicting things as being true. Whenever this happens, the subconscious mind will always be dominant and "win" the disagreement in the end, even if the conscious mind becomes dominant in the short run.

A good example of this would be a person who is overweight who gets consciously fed up with being overweight, and so they make a conscious decision to achieve a specific goal weight. If they succeed in consciously dominating the subconscious response and actually achieving their goal weight (which is unusual), they will almost always then return to the weight they started from, or even gain more weight still.

This is because the subconscious program was not changed, but the conscious mind dominated the subconscious for long enough to achieve the conscious goal weight. Once it was achieved, the motivation disappeared, the person relaxed, and the subconscious again took control. As it was running the same program that caused the original weight issue, the person returns to that weight or higher.

Only 1 in 10 people who consciously dominate their subconscious in that way will maintain their new weight, because they have also changed the subconscious program that triggered it in the first place.

The conscious mind must rest, but the subconscious mind never rests, never sleeps, and never stops trying to execute as true whatever it has accepted as being true. This is why it will always dominate in the end, unless you change the accepted program it is running.