How to know when to retire

I found a crumpled-up note as I moved my file cabinet. I was re-arranging my office and I guess the letter had fallen in between the file cabinets years ago.
I opened it and read the words that were written so long ago.
Dear Friend,
There is a friend of mine helping write these notes. My writing is so bad. I have enjoyed being together on Thursdays with you.
I pray you will be blessed where ever you will go and whatever you do. And pray the Lord will be with you always.
With Love, Jean
The letter was sent to me by her daughter who included her own letter, which was equally touching.
Dear Allison,
My mother Jean would be so pleased to know this has finally gone in the mail today. She wanted to thank you for being you.
Your visits were so meaningful and she loved you.
The timing of finding these notes couldn’t have been better. I was re-arranging my office because I wasn’t sure that I wanted to continue my work as a psychotherapist. I had downsized greatly this year following a couple of years that were too busy and hectic. I was contemplating ending my therapy practice and focusing solely on my coaching practice.
My thought was that there are many great therapists of color out there, unlike when I first started over 20 years ago when I was the only one in my community in a 50-mile radius. At that time I felt my presence in this field was needed. I thought how could I not serve my community in this way, the need was great and the providers of color were few.
I am thankful that the field of therapy has changed and I now have many great colleagues of color as well as know great Caucasian therapists who are very sensitive to and knowledgeable about issues that impact people of color. I felt like I had permission to leave the field to them, knowing that the community that I serve will be served well. I was ready to semi-retire and fully commit to my coaching practice. I love the work I do and my clients, however, I am now also enjoying coaching and I feel there is a place for a Christian coach of color.
Following reading this letter I realized that I cannot retire myself. I need to retire when God retires me. I am still choosing to see only a few therapy clients. I am enjoying this slower pace, but I now see that there are more Jeans out there whose lives I may still be able to touch in meaningful ways.
The Thursday visits Jean referenced were when I would visit her nursing home to conduct a group for the residents there. She was a bright light who enjoyed talking to me about her love for God and her desire to see Him soon. She was talkative and filled with humor. A creative soul who would express herself through writing and poetry.
She would jokingly (with a hint of seriousness) end our time together saying she hoped not to see me next week. We understood between us that she was not suicidal, but that for her to be with Jesus was her greatest wish and she was just patiently waiting for him to take her home. She was waiting to be retired by God.
I enjoyed my Thursdays also Jean, I hope you know that you gave me so much, then and now.