> Why do some people survive terrible hardships, and others don't?

> Aaron suffered from [...] depression for many years.

This answers the question, although I would prefer not to use the term 'suicidal depression', which is not a medical term.

As someone who's attempted suicide, I also believe your choice of quote is both wrong and unfair. Surviving the holocaust is in no way comparable to surviving the things your mind can convince you to do when you suffer from anxiety, depression, bipolar disorder or any other such condition.