Both Uses

insistent
in
The Kitchen Boy
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At his insistence, she would wake him every day at daybreak, almost weeping out of pity for his weak, exhausted body.†
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insistence = demand or persist
Despite this, for weeks he would get confused whenever he was entrusted with a task during an operation; Dr. Mansour's words would spring insistently into his mind, his hands would shake, and he would have to expend extraordinary effort not to botch things.†

insistently = in a persistent or firm manner

Definitions:

(1) (insistent)
persistent or continuing or firm -- especially in maintaining a view or demanding something
(2) (meaning too rare to warrant focus)