Nelson Mandela foundation wants volunteer work done on former president's 95th birthday

The Nelson Mandela Foundation is hoping that volunteers around the world donate 67 minutes of their time when South Africa's former president turns 95 next week.

Mandela remained hospitalized Wednesday in critical but stable condition for a recurring lung infection. He was hospitalized June 8.

Mandela turns 95 on July 18 and his foundation's Twitter feed is asking people to join in the volunteer-day initiative. The Twitter feed often shares quotes from the man who spent 27 years in prison during white racist rule in South Africa.

One Mandela quote shared this week said: "Abject poverty is demeaning, is an assault on the dignity of those that suffer it. In the end it demeans us all."

Released from prison in 1990, Mandela later became South Africa's first black president.