Beitzah 35b Distraction on Shabbat - טירחה בשבת

Matmonim: Daf Yomi by Rabbi David Lapin - A podcast by Rabbi David Lapin

Shabbat is about the mind. Yom Tov is about the body. Hard physical labor is permitted on Shabbat. It is mental distraction from Kedushat Shabbat (the sanctity of Shabbat) that is forbidden. Yom Tov is different.Sources