Inspiration can come from whispering advice, but it also can come from speaking up.
One can be inspired by speeches of good orators:

Eleanor Roosevelt

• Universal Declaration of Human Rights

Emma Watson

• U.N. HeForShe Campaign

Jane Goodall

• What Separates Us from the Apes

Malala Yousafzai

• United Nations Youth Assembly

Margaret Thatcher

• Iron Lady

Maya Angelou

• On the Pulse of Morning
• Phenomenal Woman

Michelle Obama

• Enough is enough
• Eulogy for Maya Angelou

Ruth Bader Ginsburg

• Looking back on a life spent working for equality

Dalai Lama

• A guide to happiness

Barack Obama

• Honoring John McCain
• 2004 Keynote Speech
• ‘A More Perfect Union’
• Honoring Reverend Pinckney
• 50th Anniversary of the Selma Marches

Martin Luther King

• I Have A Dream
• Remaining Awake Through a Great Revolution

John F Kennedy

• We Choose to go to the Moon
• John F. Kennedy – Secret Societies
• Inaugural Address

Nelson Mandela

• In his own words
  BBC News

David Cameron

• David Cameron Full Speech: Britain and Europe