Most of us now realise even seemingly successful, happy people - no matter the facade they present to the world - can suffer from what former British Prime Minister Sir Winston Churchill dubbed "the black dog".
It is undoubtedly a huge step forward that depression is much more talked about than it was in the past; certainly more than during Churchill's time when the prevailing thought process was to always demonstrate (in public at least) a stiff upper lip.
Thankfully, that attitude has - and is - changing. In this country, Sir John Kirwan and other high-profile personalities have played big parts in breaking down past barriers surrounding depression and mental illness.
American comedy star Ruby Wax - a keynote speaker at the Apac Forum healthcare conference currently being held in Auckland - has spoken of her experiences after having been diagnosed with clinical depression in 1994, following the birth of her second daughter. Wax says she tried for the best part of a decade to keep the diagnosis quiet and was "mortified" when the details were first publicly revealed.
It is probably a not uncommon reaction. But, as is now recognised, it is not a healthy one. Wax says she is now happy to be a "poster girl" for mental illness and says promoting an understanding that mental health is a big issue in the world is one of her priorities.