Mental health is the goal of any good psychotherapy.  This is obvious.  What’s not so obvious is what it actually means to be mentally healthy.  Clinical psychologist Jonathan Shedler (2010) defines a mentally healthy individual as someone who:

Generally finds contentment and happiness in life’s activities.
Enjoys challenges and takes pleasure in accomplishing things.
Is able to find meaning and satisfaction in the pursuit of long-term goals and ambitions.
Is articulate; can express themselves well in words.
Is resilient in the face of stressors and challenges.
Makes good decisions with regards to their health.
Appears comfortable and at ease in social situations.
Is compassionate, and forgiving of imperfections in themselves and others.
Is capable of sustaining meaningful love relationships characterized by genuine intimacy and caring.
Has the capacity to recognize alternative viewpoints, even in matters that stir up strong feelings.
Is able to assert themselves effectively and appropriately when necessary.
Tends to be conscientious and responsible.
Is able to find meaning and fulfillment in guiding, mentoring, or nurturing others.
Appreciates and responds to humor.
Has the capacity to be energetic and outgoing.
Is able to use their talents, abilities, and energy effectively and productively.
Is psychologically insightful; is able to understand themselves and others in subtle and sophisticated ways.
Tends to express emotion appropriately in quality and intensity to the situation at hand.
Uses healthy and adaptive coping strategies.
Appears to have come to terms with painful experiences from the past; has found meaning in and grown from such experiences.
Is empathic; is sensitive and responsive to other people’s needs and feelings.
Is able to form close and lasting friendships characterized by mutual support and sharing of experiences.
Has an active and satisfying sex life.
Is capable of hearing information that is emotionally threatening and can use and benefit from it.
Has moral and ethical standards and strives to live up to them.
Finds meaning in belonging and contributing to a larger community (e.g., organization, church, neighborhood).
Is creative; is able to see things or approach problems in novel ways.

The goals of effective psychotherapies go beyond just symptom reduction to help individuals to create lives worth living.