I'm sure you already know this. What I have noticed is that we form a "model" for how our life should be and what we need to do in order to go from here to there. So if I have a well-paying job then I will have lots of money and that means I will have lots of friends and lots of happiness. In our minds it's like an equation. A+B=C. We feel the same about forgiveness. "If I say I am sorry and work to make things right, then the person that I wronged will forgive me.
But things don't work out like that all the time. Sometimes people are not able to forgive and money certainly does not bring happiness.
However, it is not the destination, or the "C", that brings happiness. It is the process. Happiness comes through loving every moment of the journey and having gratitude for this beautiful gift of a life and other beautiful lives that we can touch.
I believe that the turning point in depression and the only way to proceed to a full recovery from depression is to look at yourself, accept what you see, and say to yourself "I love myself despite my flaws and imperfections because I am a child of God and He loves me."
Here is a presentation that changed not only my outlook on life but my life as a whole. I hope that it may have the same impact on you as well.