A personal development is beneficial and complete when an Individual knows to experience all the emotions - Joy, anger, resentment, excitement, attraction, jealousy, pity, pleasure, desire, fear and other emotions.

Also that this person discovered the dimension beyond emotions - The peace, space and the deep happiness. That are not derived from any fulfillment or from a certain emotion.

There is a common stage in the process of personal developments where the person thinks that only the happy feelings are good and painful feelings are not good.
That they should always be happy.
Some of them stay stuck at this point and repress or struggling with the emotions they classify as "not good".

Eventually the understanding that all emotions are perfect arise.

It is possible to feel peace or pleasant feelings even if there is certain emotions within us. That happens when we found happiness not through our shifting emotions. The deep happiness comes from another source and it can not be due to external things :)

We can divide the creation of happiness into two processes that can occur simultaneously:

1. Liberation from suffering, including the ability of -
Stop suffering.
Interpretate reality correctly.
Bringing a loving and healing attention to Painful blockages from the Past.
Being in love with all our emotions.
Not classifing our emotions as good or bad.
Identifying the painful baggage from the past and not loading the pain with more external evidences.
Identifying pain as it, when it appears.

2. Finding the permanent happiness.
Regardless of the existing internal and external content.