The Bnei Yissaschar (Kislev 4:134) teaches that one can pray through praising Hashem. For instance, in the second brachah of Shemoneh Esrei, when we say, “the Healer of the sick,” we can think, “You heal the ill, so please heal…” This hidden prayer within praise ascends to Heaven without obstruction.
While standard requests may be blocked by malachim who argue our unworthiness, no one can stop a Jew from praising Hashem. The praises rise, Hashem reads between the lines, and fulfills the request concealed within the praise.
Emuna Daily 
ty!
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This is so beautiful! Should it be avoided on Shabbat ?
Agree! That is a very good question, considering you are just thinking it. I need to look into that. Let me know if you receive an answer.