I am at a loss for words / I find no words to

I have no ability to speak. An expression describing amazement, appreciation, or astonishment at something or an action, to the extent of an apparent loss of the ability to speak or to describe one's feelings.

(“For there is not a word in my tongue, but, lo, O Lord, Thou knowest it altogether.” – Psalms 139:4; also: “He fixed his sandal—and there was no word in his mouth... / And silence returned, and the camp slept” – Shaul Tchernichovsky, Muhammad; also: “I knew that I had no words to calm myself, and yet I stood to listen” – S.Y. Agnon, In the Prime of Her Life)

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