The Eitz Yosef (cited in a footnote in 'The Complete Artscroll Siddur', page 316) quotes the Zohar who says:
All the weekday blessing and success come as a result of the Shabbos’s holiness. Therefore, what you put into Shabbos is what you get out of it. The amount of energy (spirituality) you inject into sanctifying the Shabbos, will determine the amount of blessing that will be deposited into the coming week.
Where does the Zohar say this?