If not us, who? And if not now, when?

Meaning:

The famous quote If not us, who? And if not now, when? is meant to inspire people to take action now and to not wait for someone else to step up. It implies that a person should find who they truly are and use it to change the world.

Answer and Explanation:

Although this saying has been made popular by several political figures such as Ronald Reagan and John F. Kennedy, its origins lie in Hillel the Elder, a Jewish leader, who stated, If I am not for myself, who will be for me? And being for my own self, what am I? And if not now, when?. This quote has been used over the years in slightly different verbiage by several different people.