The Presents of Yom Tov vs. the presence of Shabbos

From B'yam Darkecha on the Beauty of Shabbos & the Yomim Tovim: R Yossi Michalowicz by R Yossi Michalowicz.

pp: 339 - 341 ;345-347: Understanding the levels of Chaya ( Betul Bemetzius) & Yechida (Betul Be'Etzem) as exteneded levels of Neshama. Understanding the Difference between what happens on Yom Tov as opposed to Shabbos.