"The lesson from positive psychology is that positive mental health is not just the absence of mental illness.

It is all too commonplace not to be mentally ill but to be stuck and languishing in life.  Positive mental health is a presence: 

the presence of positive emotion,

the presence of engagement,

the presence of meaning,

the presence of good relationships,

and the presence of accomplishment. 

Being in a state of mental health is not merely being disorder free; rather it is the presence of flourishing.

Let there be no doubt about this:  traditional psychotherapy is not designed to produce well-being, it is designed just to curtail misery..."

From Flourish by Martin E. P. Seligman