I thought that we lived in an era that looked back on the horrors of Rwanda and Yugoslavia and said 'never again' and meant it. Sadly I think the crisis in Syria proves all of us wrong and we are all collectively guilty for allowing the country to collapse as it has. Three years on and we see both a biblical level exodus combined with a levels of violence that few of us could have imagined in our wildest dreams. Over nine million people, nearly half of the country, forced from their homes and on the move exposed to a new life of uncertainty, poverty and too often despair.
Over the past three years, I have often commented on the events in Syria that have unfolded with cruel intensity. And during this period, I have also been struck by the sheer audacity of the regime and - later - by the barbarity of so-called jihadist elements that together have used the Syrian people as cannon fodder in pursuit of their objectives and interests.
Aid workers work in some tough places. Somalia, Afghanistan, Pakistan, Central African Republic, Syria...the list goes on. It can be a difficult life - faced with daily tragedy on a massive scale, far from family and friends for months on end, unchanging stodgy and irregular food, limited clean water.
Mohammed, a teacher from Syria who lives in Zaatari refugee camp in Jordan, is participating in the Education for All Global Monitoring Report's #TeacherTuesday campaign. His daily struggle to help Syrian refugee children underlines the need to support teachers in difficult situations - and to make education a more central part of humanitarian efforts in conflict zones.
Three years ago, the world watched in shock as Syria slowly descended into bitter conflict. Once thriving communities have been utterly destroyed. Nine million people are now in need of humanitarian assistance, with their future looking perilous and uncertain. The scale of the humanitarian crisis which results from a conflict of this kind can be overwhelming. But we cannot let ourselves forget its human face.
The crisis engulfing Crimea is a grave one. Vladimir Putin's armies have cut the region off from the rest of the nation, and are insisting on an illegal referendum in order to give elusive legitimacy to a brazen act of aggression. Now is not the time for the West to take options off the table - even rather unpalatable ones.