United States President Barack Obama spoke before the United Nations General Assembly on Wednesday morning, amid the backdrop of the US and partner nations launching airstrikes against the extremist group ISIS in Syria.

We bring you some of the memorable quotes from the speech as he called for united action against violent extremism:

• We have reaffirmed that the United States is not and never will be at war with Islam. When it comes to America and Islam, there is no us and them - there is only us, because millions of Muslim Americans are part of the fabric of our country.

• The terrorist group known as ISIL must be degraded, and ultimately destroyed. No God condones this terror. No grievance justifies these actions. There can be no reasoning - no negotiation - with this brand of evil. The only language understood by killers like this is the language of force. So the United States of America will work with a broad coalition to dismantle this network of death.

• Those who have joined ISIL should leave the battlefield while they can. Those who continue to fight for a hateful cause will find they are increasingly alone. For we will not succumb to threats; and we will demonstrate that the future belongs to those who build - not those who destroy.

• The ideology of ISIL or al Qaeda or Boko Haram will wilt and die if it is consistently exposed, confronted, and refuted in the light of day. Look at the new Forum for Promoting Peace in Muslim Societies -- Sheikh bin Bayyah described its purpose: "We must declare war on war, so the outcome will be peace upon peace."

• No children - anywhere - should be educated to hate other people. There should be no more tolerance of so-called clerics who call upon people to harm innocents because they are Jewish, Christian or Muslim. It is time for a new compact among the civilized peoples of this world to eradicate war at its most fundamental source: the corruption of young minds by violent ideology.

• All religions have been attacked by extremists from within at some point, and all people of faith have a responsibility to lift up the value at the heart of all religion: do unto thy neighbor as you would have done unto you.

• America and our allies will support the people of Ukraine as they develop their democracy and economy. We will reinforce our NATO allies, and uphold our commitment to collective defense. We will impose a cost on Russia for aggression, and counter falsehoods with the truth. We call upon others to join us on the right side of history -- for while small gains can be won at the barrel of a gun, they will ultimately be turned back if enough voices support the freedom of nations and peoples to make their own decisions.

• When nations find common ground, not simply based on power, but on principle, then we can make enormous progress. And I stand before you today committed to investing American strength in working with nations to address the problems we face in the 21st century.

• America is and will continue to be a Pacific power, promoting peace, stability, and the free flow of commerce among nations. But we will insist that all nations abide by the rules of the road, and resolve their territorial disputes peacefully, consistent with international law. That's how the Asia-Pacific has grown. And that's the only way to protect this progress going forward.

• As we speak, America is deploying our doctors and scientists - supported by our military - to help contain the outbreak of Ebola and pursue new treatments. But we need a broader effort to stop a disease that could kill hundreds of thousands, inflict horrific suffering, destabilize economies, and move rapidly across borders. It's easy to see this as a distant problem - until it isn't.

Image: US President Barack Obama addresses the 69th United Nations General Assembly at the UN headquarters in New York. Photograph: Mike Segar/Reuters