Humans judge people quickly. Once they have their read they tend to find ways to support it rather than to be open to the idea their first hit might have been off. You can miss a lot this way.
Separate but related, people get in habits with their behavior , These habits are hard to change and I mean this in the broadest sense.
For example if you act as a decent person and you have for decades, it’ very unlikely you are going to start acting like a jerk unless something goes wrong in your brain. The opposite is true as well. If you routinely act like jerk, anyone expecting you to act otherwise is probably going to be disappointed.
In this way the past predicts the future but as always awareness and astrology can help those who want to develop new patterns. The chart describes a person’s energy. It’s just energy so even if you have done rotten things with your energy for months or years or even decades, it’s fairly simple to redirect once you know what you’re dealing with, provide you have the will.
Where people get in trouble is when they try to give a person a desire they do not have. This maneuver is as common as sunshine I’d say.
How often do you come off your first impression?