“As Kerry put it in a speech to the U.S. Institute of Peace on Thursday, before heading to the airport, “Time and turbulence can generate new possibilities.” However, he also noted, “There are moments in managing world affairs … when the elements required for progress simply do not exist,” and “we do not know… whether the right possibilities have yet come together in connection with Syria.” But, he added, “We have an obligation … to test those possibilities to the fullest.”
http://www.slate.com/articles/news_and_politics/war_stories/2015/11/america_s_fight_against_isis_this_weekend_could_be_critical_for_syria_s.html
