So progress is not inevitable. History does not always march forward. History can travel sideways and sometimes backwards. Building trust after years of conflict takes time. Being able to look past the scars of violence takes courage. Securing the gains of freedom and democracy requires good faith and strength of will, and tolerance and respect for diversity, and it requires vigilance from all citizens. The American people know well that rights and freedoms are not given; they have to be won through struggle and through discipline, and persistence and faith. And it's often young people who have led these struggles; who have compelled us to slowly but surely perfect our own union in America over time.