Verses with the word quietness in the New Testament (2 verses):

Acts 24:2
And when he was called forth, Tertullus began to accuse him, saying, Seeing that by thee we enjoy great quietness, and that very worthy deeds are done unto this nation by thy providence,

2 Thessalonians 3:12
Now them that are such we command and exhort by our Lord Jesus Christ, that with quietness they work, and eat their own bread.