US President Barack Obama and first lady Michelle Obama are sending their wishes and prayers to former South African leader Nelson Mandela on his 95th birthday.
Mandela is critically ill in the hospital, although he's said to be improving and could be discharged soon.
The Obamas say the world can honour Mandela by heeding his example and serving others.
The couple met with Mandela's family last month while in South Africa and visited Robben Island, where the anti-apartheid figure spent 18 years as a political prisoner.
The president and first lady say they were deeply moved by the visit to the prison. They say Mandela's commitment to equality, dignity and reconciliation should be a beacon for future generations.