"Olof Palme's thoughts and actions have influence upon many people today" Pierre Schori, former deputy foreign minister told guests at the seminar.
Monday 28th February is the 25th anniversary of the assassination of Olof Palme, a case which is still officially open with Swedish police.
Saturday's seminar was organized by the Olof Palme International Centre. Former ministers, party colleagues and family members rallied in the ABF-house - which has also renamed one of its meeting rooms to The Palme Room.
Ingvar Carlsson, who knew Palme for 30 years and became his successor as prime minister, spoke of his tremendous political nerve, presence and ability to communicate.
"I honestly admired Olof Palme's ability to inspire" Carlsson told those present.
Carlsson emphasized Palme's breadth. "He was an ideologue and practitioner, brilliant in both the spoken and written word on both the national and international stage."
"He had the ability to face a problem in small town Sweden one week and stand on the UN's podium the next" Carlsson continued.
Lena Hjelm-Wallen was elected to parliament in 1968 and was minister for education in Palme's government, and later foreign minister.
"Olof Palme opened the eyes of many of us to the world, but we must also remember his extremely important impact on domestic politics" she told the attendees at ABF-huset
Olof Palme was murdered by an unknown assassin as he made his was home from the cinema with his wife on the evening of the 28th February 1986. His murder, which remains unsolved, is often seen as a watershed in Swedish society.