Many of these come from the wider Salafist trend of puritan Islam, much of which has traditionally rejected violent jihad, largely on tactical grounds, in favour of quiet proselytising.Alex Gallo, of West Point's Combating Terrorism Centre (CTC), says that core al-Qaeda has evolved a most effective and flexible approach, a bit like Michael Porter's theory of the value chain.
Curiously, as a choreographer he tended to avoid obvious virtuosity in favour of quieter, precise, movement.
In his pictures – which he describes as 'cinematic street photography' – he sidesteps clichés of bustling street scenes in favour of quieter moments.
If modern Germany is more at ease abjuring the power and responsibilities of leadership in favour of a quiet, comfortable life, the frictions and misunderstandings making the European crisis worse are rooted in other psychological and cultural factors.
"When I beat Felix Trinidad in 2001, I was 35," says Hopkins, who eschews the high-octane lifestyle of fellow American legend Mayweather in favour of a quiet family life in the small town of Hockessin, Delaware, with his wife Jeanette and their three children.
Since 7 May, some of the public recriminations involving Ukip have included: Farage's decision to resign, only to go back on his decision four days later, prompting one of the party's biggest donors, Stuart Wheeler, to call for him to step back in favour of someone quieter.
On Sunday his family "kindly declined" an offer by Australian Prime Minister Tony Abbott's to have a state funeral in favour of something "very quiet and very private", Mr Abbott said.
Sibelius's Sixth is often described as "low-key," which effectively means the composer abandoned his usual rhetoric of struggle and triumph in favour of a muted expressionism that leads to music at once quiet and extreme.
The valley floor can get crowded with people, but private cars are restricted in favour of free shuttles, which helps quiet the chaos.
Yet despite these stakes, business voices who are willing to speak out in favour of EU membership are told to keep quiet.
Lives of quiet desperation.
