in peace and quiet (Para.1)
in peace and quiet: calmly, in a peaceful and silent state
Please let me get on with my work in peace and quiet. 请让我平静地做我的工作吧。
Don't confuse this phrase with "at peace", which means "free from war or quarrel" or "in a state of quietness".
These two countries have been friendly and remained at peace for hundreds of years. 这两国一向友好相处，几百年没有发生过战争。
All is at peace in the dead of the night. 深夜万籁俱寂。