If you want to cultivate a habit, do it without any reservation, till it is firmly established. Until it is so confirmed, until it becomes a part of your character, let there be no exception, no relaxation of effort.
If one undertakes retrospection of the day's events, one must do it regularly at the appointed hour, not fitfully, not doing it today, neglecting to do it tomorrow and the day after and then taking it up again on the fourth day. Such irregular practice is not conducive to the confirmation of the habit of retrospection.
Attachment and aversion are the root cause of karma, and karma originates from infatuation. Karma is the root cause of birth and death, and these are said to be the source of misery. None can escape the effect of their own past karma.