A best principle to bear in mind for this is the principle of "sowing and reaping." "As you sow, so shall you reap," as Scripture admonishes. A related guide is the Golden Rule: "Do unto others as you would have others do unto you."
People who believe and apply this principle, which some call "karmic justice," are less likely to hurt themselves or their neighbor in the course of their life journey. Their choices or decisions will always be governed by their awareness of the long term or essential effects of their deeds.
A woman I'd been counseling said she has become out of control and violent in reacting to her husband's infidelity. Moving on to our talks, she confessed that she herself had secretly cheated on her husband multiple times during business trips.
Yes, the couple is experiencing high hopes. They confessed their unfaithfulness to each other and vowed to heal and change. Individually and maritally, they desire to recover through the deep process of therapy and counseling.
Yet both of them have to reckon with the reality of the reaping effects or consequences of their past sowing in their individual well being and marital state. Surely there is hope and healing is always possible. Even in a fragmented state, one can get stronger and be renewed from day to day - leading to a fuller life.
Healing and growth does not stop with deep childhood trauma or ongoing consequences of past mistakes. Each new year presents new opportunities for loving and changing. The "missed development" can be made up and remedied in whatever stage of life. It's never too late to change and be whole.