The post read: ‘Carry out a random act of kindness, with no expectation of reward, safe in the knowledge that one day someone might do the same for you.’
The caption accompanied the post: ‘Words have the power to inspire, which is why we’re happy to share some of our favourite quotes,’ .
‘From members of the public to public figures, from teachers and students to young leaders, we begin with a quote from Diana, Princess of Wales.’
The post was quickly praised by their followers with one commenting: ‘Your mum was one of a kind and left behind a legacy that generations to come will never have met her but still be inspired by her works.
‘Like you prince Harry, we saw what you saw in choosing Meghan because she also reminds us of your mum with her own heart focusing on the greater good. This broken society needs more random acts of kindness. Thank you for inspiring us.’
‘She was an amazing person. It is wonderful to see her legacy carried forward,’ another wrote.
Since launching their own independent account in April, Prince Harry and Meghan Markle have been active users on social media.
They have amassed 9.3 million followers in less than a year.