Show (one's) (true) stripes verb phrase
To reveal one's true beliefs, personality, character, or disposition
I believe that a person's taste in fashion, music or food will partly show his or her true stripes.
Only when it comes to benefits people show their stripes.
The difficulty he encountered this time helped show his so-called friends' true stripes.
A desire to do something, which is random, sudden and unaccountable
People tend to believe what they want to be true.
To fall suddenly and heavily to the ground
It is believed that someone who has engaged in immoral behavior will always be be prone to it
The verb "show" should be conjugated according to its tense.