Within all of us we have the propensity to be deceitful to ourselves and others, whenever we get into a habit to be deceitful to get our own way and if we THINK it worked, there is a danger of it becoming an integral part of our personality, then as we all have seen it with others and perhaps ourselves.
The only one being deceived is us or as Paul said in partial quote "Deceiving OURSELVES with false reasoning".
Like the old saying goes, "You can fool some of the people some of the time, but you can't fool all the people all the time"
As Christ said, "The truth will set you free" Not lying or deceitfulness
abr