に固執する

to stick to; to cling to; to persist stubbornly in

→ に
phrase Rare #20,673
to stick to; to cling to; to persist stubbornly in Used with an opinion, theory, belief, or plan. It often suggests stubbornly refusing to change or compromise.
JA: 我々は我々の計画に固執するべきだ。
EN: We should stick to our plan.

彼は自分の確信に固執する

He clings to his convictions.