A Beginners Mind
A first principle is to be optimistic.
I have felt depressed in my life and gone through toughs times, thinking there is no way out. At that moment I didn’t know what to do, how I was supposed to feel and think.
I was lacking an understanding of this first principle to be optimistic.
When the dark times come, even when you are in the middle of despair. You must remember to be optimistic that the light will come. The morning brightness will reliably come after the dark night.
And remember all of the other times that you were in despair and it turned out the future is better for you than the past.
References:
https://quran.com/93
https://www.youtube.com/watch?v=OqXaCx_tNmg
Pandu's Notes 