This is the advantage of the level called “Yehuda revealed.”
בְּחִּינַת הו דָּאָּה בְּגִּילּוּי ש ֶבַּתְּ פִּלָּּה , revealed,” meaning the level of ‘הוֹדַָּׁאָּהַׁ-humble submission and devotion’ that becomes fully revealed in “the Prayer” of Shemona Esrai,
ש ֶתִּּ הְיֶה "ךיֶבְי וא ףֶר ועְּבךְדָּי" – so that “his hand overtakes the back of the neck of his (spiritual) enemies,”
בְּש ָּעָּה ש ֶעו סֵק בְּ "ךיֶבְי וא ףֶר וע" וַאֲזַי חו לֶפֶת וְעו בֶרֶ ת מִּ מֶּנּוּ הָּאַהֲבָּה , מִּ כָּּל מָּקו ם נִּש ְאַר רְ ש ִּ ימוּ 'ּוכו , meaning, at the time that he deals with physical matters, which are like “the back of the neck of his enemies,” when the love (and fear) of Hashem he experienced in prayer dims and fades away, nonetheless, the “imprint,” i.e., effect, of the love and fear remains with him, enabling him to overtake and transform his physical matters into holiness.
The power to connect the love of Hashem during prayer with the transformation of his physicality into Holiness is from the higher level of Yehuda, bittul, submission-devotion to Hashem, experienced in Shemona Esrai.
Without the higher level of bittul, the love of Hashem would fade away after prayer and he would get caught up again in the desires for physicality.
The ability to retain the connection to Hashem from prayer afterwards (at least to some extant) comes from the higher level of bittul of “Yehuda revealed,” which is in Shemona Esrai.
This is because it is a bittul to Hashem as He “Encompasses all worlds,” and therefore is found in the physical world as well. Therefore, one is able continue that connection to Hashem that he had in prayer even in his physical matters.
However, this is only true when his physical needs are treated as “the back of the neck,” and not as “the face,” as explained above.
Even if someone reaches all the levels of prayer explained in the maamar, including the higher bittul of Shemona Esrai, nonetheless, if he willingly puts himself passionately into his physical desires, he will not be able to (fully) transform them into holiness. The person still needs to work on himself to not put his passions into his physical needs and desires.
