The mettle of a man is tested in adversities and he,
who remains firm in his beliefs comes out shining.
Definition of mettle
1a: vigor and strength of spirit or temperament (see TEMPERAMENT sense 1a)
a girl of … mettle who lost a baby brother to leukemia
— Bill Zehme
b: staying quality: STAMINA
equipment that proved its mettle
proved his mettle in battle
2: quality of temperament or disposition
gentlemen of brave mettle
— William Shakespeare
on one’s mettle
: aroused to do one’s best
Are you up to the task?
A time is coming, very soon, that you will be tried and tested.
What is the depth of your mettle?
Do not fear what you are about to suffer.
Behold, the devil is about to throw some of you into prison,
that you may be tested, and for ten days you will have tribulation.
Be faithful unto death, and I will give you the crown of life.