Drawing All To Hashem
את קרבני לחמי כו'
"My offering, My food" (Bamidbar 28:2), and so on.
The piece opens with the pasuk in which Hashem calls the daily offerings 'My offering, My food,' setting the stage for a discussion of the korbanos.
פי' הקרבן מה שמקרבים כל הדברים לשורשן לברר שהם מהשי"ת וזהו תפלות נגד תמידין ג"כ שמבקשין מהשי"ת
The meaning of the korban is that we draw all things close to their root, to make clear that they come from Hashem Yisbarach; and this is the idea that the tefillos correspond to the daily tamid offerings as well, for through them we ask of Hashem Yisbarach.
A korban, rooted in the word 'to draw near,' is the act of returning everything to its source in Hashem, and tefillah parallels the tamid offerings because it too is an act of turning to Hashem and recognizing that all comes from Him.
על כל קטן וגדול ומשבחין בברכה על כל דבר לברר שהכל ממנו וע"י זה נקרב ונדבק הכל לשורשו
Over every matter, small and great, and we offer praise with a berachah upon every single thing, in order to make clear that everything comes from Him; and through this all is drawn close and bound to its root.
Just as we ask Hashem for our needs in everything, large and small, we also recite a berachah of praise over each thing, thereby declaring that it all comes from Him; this recognition is what binds every matter back to its root.
ובשבת יש מוסף וההוספה לידע שגם מה שזוכה אדם בעבודתו ית' ג"כ רק ממנו ית':
And on Shabbos there is a Mussaf, and this 'adding' is to know that even that which a person merits through his avodah of Hashem Yisbarach is likewise only from Him Yisbarach.
The extra Mussaf offering of Shabbos teaches an additional point: even the spiritual gains a person earns through his own avodah are themselves a gift from Hashem and not something he produced on his own.
Summary: The Sfas Emes explains that the essence of a korban lies in its root meaning of drawing near: through it we return all things to their source and proclaim that everything stems from Hashem Yisbarach. Tefillah parallels the daily tamid offerings, for in our requests over every matter, small and great, and in the berachos of praise we recite over each thing, we declare that all comes from Him, and through this declaration the whole of creation is drawn close and bound to its root. He then adds that the Mussaf of Shabbos, an 'additional' offering, carries an additional lesson: even the spiritual attainments a person merits through his own avodah are likewise only from Hashem. Thus all our service, from physical needs to the loftiest avodah, ultimately points back to Hashem as its sole source.