to continue believing in something or someone
信念を保つ
"Even in tough times, you must keep faith."
"困難な時でも、あなたは信念を保つしなければならない。"
the matter is settled or finished
Things often seem worst just before they improve.
the moment when a change becomes unstoppable
to reveal a secret by mistake
to make a serious mistake or spoil something
a fundamental change in approach or underlying assumptions