Prince William is carrying on his late mother Princess Diana's charitable legacy!

On Monday, Feb. 6, the 34-year-old royal stepped out to promote his Heads Together organization, which aims to reduce negative stigmas surrounding mental health issues.

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In an impassioned speech on the topic, William spoke candidly to a group of London's key health journalists — and revealed "we all" struggle with mental instability at times.

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Kate and William outside the Guild of Health Writers event on Feb. 6.

"Mental health was the great taboo. If you were anxious, it’s because you were weak," William said at the Guild of Health Writers event, which he attended with his wife, Kate Middleton. "If you couldn’t cope with whatever life threw at you, it’s because you were failing."

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"Successful, strong people don’t suffer like that, do they? But of course — we all do. It’s just that few of us speak about it," he continued, according to People.

For the special outing, William looked dapper in a navy blue suit with a red tie while his 35-year-old wife stunned in a purple peplum jacket and skirt by Oscar de la Renta. Kate accessorized the chic look with black tights, matching pumps and a simple black clutch.

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Kate and William with their kids Prince George and Princess Charlotte.

During his speech at the Guild of Health Writers conference, William additionally revealed he first became interested in mental health issues while working as an air ambulance pilot.

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"It was suicide, a subject that is so often hidden. The suicide rate among young men in this country is an appalling stain on our society. Suicide is the biggest killer of men under 40 in this country," he said. "Not cancer, not knife crime, not road deaths — suicide. If one of these other issues took so many young lives, there would be a national outcry. This silence is killing good people."

"Catherine [found a passion for this subject] through her work with children and young families," he added.

Click through the gallery below to see fascinating royal facts about Kate and William!