From The Master's Wen Chao (文钞) series:
https://www.buddhanet.net/pdf_file/yin_kuang.pdf
Receiving your poetic letter from afair, I cannot but feel embarassed! From an early age, this old monk has lacked education. My knowledge is uncertain and nebulous. Having drifted here and there for many years, far away from my native village, I am now sojourning on [Mount Putuo]. Never did I expect that such a remarkable person as yourself, a scholar versed in the Mind-Dharma of Confucianism and Buddhism, who has studied at the feet of masters far and wide and made their outstanding practices his own, would condescend to seek advice from me. Moreover, you have praised me so excessively that my mind is perplexed and uneasy.
I venture to think that with your broad, well-rounded education and your lofty, far-reaching knowledge, you surely cannot have doubts about such ordinary matters as those raised in your letter. It must be that your intention is to act as an example, to show the Way to those who cultivate alongside you.
However, since you have presented knowledge as ignorance, there is nothing to prevent me from presenting ignorance as knowledge and I will try to answer your questions in the order raised. I certainly would never date imitate the old mandarin who sits as a judge but is in reality an aging student submitting his examination papers. Therefore, if the following explanations contain errors, please revise and amend them.
Although the mind is what matters most in Buddha [name] recitation, oral recitation should not be disparaged. This is because body, speech, and mind reinforce one another. Although the mind may be focused on Amitabha Buddha, if the body does not bow respectfully and the mouth does not recite, it is difficult to receive benefits. For example, even when lifting heavy objects, ordinary people assist themselves by shouting aloud; how can you not do at least as much when trying to concentrate the mind and attain samadhi!
https://wenshuchan-online.weebly.com/biography-of-great-pure-land-master-yin-guang-1861-1940.html