The unity of millions that can stem from one evil act. The strength, courage and determination that often comes from adversity. The daylight following the darkness.
After the bloodshed and incessant school attacks of 2014, let 2015 be a year of hope, of action and the fulfilment of a promise made 15 years ago to boys and girls across the world. They are waiting and watching.
The famous novelist JK Rowling, leader of a charity helping 25 million orphans, recently asked; "Who is easier to silence than a child?"
Because children have no votes and traditionally little voice, the expectation is that they will not protest. But be certain about this - young people whose rights have been violated will be silent no more.
Days of despair
I know this is true because in the space of a few hours last month I watched in awe as tens, then hundreds, then thousands, then hundreds of thousands showed their outrage and their unity following an attack on a school in Pakistan in which 132 children were massacred.
A petition launched in the aftermath of the attack, to honour those killed and demanding education for all, is now 1.5 million names strong and is still growing as each precious minute passes. One voice.
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In the future, people will look back on this generation and they will say an historic civil rights struggle for the rights of young people was born.
This, I believe, must be a time of hope. People need hope. Hope is that small voice that says we will not be silenced if we have strong beliefs we want to follow.
We must never stop believing that the cause we are talking about can be won in our generation.
And remember, we do not break promises to children.
We crossed our hearts. The United Nations told the world that every boy and every girl, everywhere, would have access to a school and to an education and to opportunity.
Its official name is Millennium Development Goal 2 and the official target is universal primary education. Unofficially, it's the only chance of a life for millions and millions of children. Now, as the clock ticks down towards zero hour we are trying but toiling to make it happen. But we can change it. There is time.
There are seven other MDGs, all vital but none as critical to our children's future. With just 11 months and 20 days to go, there are still 58 million boys and girls who will be failed by a broken promise and never even have a day's learning. There are hundreds of millions more who will not finish their education.
Less than a month ago two champions of global education and girls' rights shared a platform in Oslo, Norway. Malala Yousafzai and Kailash Satyarthi stood in front of the world, proud and deserving joint winners of the Nobel Peace Prize.
Their brave words and actions rightly rewarded, then so many of their hopes for the future crushed when six days later came the worst school atrocity of all time. 132 boys and girls slaughtered by Taliban gunmen in Peshawar.
On the same day 15 children were bombed to death by terrorists attacking a school bus in Yemen. The next day dozens of school pupils were killed and 100 abducted in a repeat of the Boko Haram attack almost nine months ago when 200 schoolgirls in Nigeria were abducted, yet to return home.
Thousands of young Yazidi women and children are being used by ISIL as sex slaves. And there are now an estimated 250,000 child soldiers conscripted into militias round the world; 100,000 of them girls.