To feel a strong, often emotional desire for something you do not have or cannot easily reach.
"After years abroad, she longed for the familiar streets of her hometown."
We long for the day when all people will be judged not by the color of their skin but by the content of their character.
— Martin Luther King Jr., 'I Have a Dream' speech, 1963 (paraphrased from the speech's themes; the direct quote is '...not be judged by the color of their skin but by the content of their character')