I found this on the internet on New Year's Eve last year when I had a bout of the blues (am on tablets for low mood) and was made redundant from work in the same week as was told I had PBC. It inspired me to move on and I hope it helps someone too.
START WHERE YOU STAND
Start where you stand and never mind the past,
The past won't help you in beginning new,
If you have left it all behind at last
Why, that's enough, you're done with it, you're through;
This is another chapter in the book,
This is another race that you have planned,
Don't give the vanished days a backward look,
Start where you stand.
The world won't care about your old defeats
If you can start anew and win success,
The future is your time, and time is fleet
And there is much of work and strain and stress;
Forget the buried woes and dead despairs,
Here is a brand new trial right at hand,
The future is for him who does and dares,
Start where you stand.
Old failures will not halt, old triumphs aid,
To-day's the thing, to-morrow soon will be;
Get in the fight and face it unafraid,
And leave the past to ancient history;
What has been, has been; yesterday is dead
And by it you are neither blessed nor banned,
Take courage, man, be brave and drive ahead,
Start where you stand.
Berton Braley (29 January 1882 – 23 January 1966) American Poet