“Opportunities to find deeper powers within ourselves come when life seems most challenging.”

Address to the United Nations (1963)
Context: When we talk of the equality of man, we find, also, a challenge and an opportunity; a challenge to breathe new life into the ideals enshrined in the Charter, an opportunity to bring men closer to freedom and true equality. and thus, closer to a love of peace.
The goal of the equality of man which we seek is the antithesis of the exploitation of one people by another with which the pages of history and in particular those written of the African and Asian continents, speak at such length.
Exploitation, thus viewed, has many faces. But whatever guise it assumes, this evil is to be shunned where it does not exist and crushed where it does.

Source: Paula

Silver Surfer, speaking to Thanos, in Silver Surfer, Vol. 3, no. 35 "The Name is Thanos"

Joy: Share it! p. 44.
Joy: Share it! (2018)

Quotes, NYU Law School speech (2006)

As quoted in The Daily Beast http://www.thedailybeast.com/articles/2011/12/03/cain-quotes-pok-mon-movie-in-final-speech.html (2011).
Variant: Life can be a challenge. Life can seem impossible. It's never easy when there's so much on the line.

The Sacred Pipe (1953)
Context: The first peace, which is the most important, is that which comes within the souls of people when they realize their relationship, their oneness, with the universe and all its powers, and when they realize that at the center of the universe dwells Wakan-Tanka, and that this center is really everywhere, it is within each of us. This is the real peace, and the others are but reflections of this. The second peace is that which is made between two individuals, and the third is that which is made between two nations. But above all you should understand that there can never be peace between nations until there is known that true peace, which, as I have often said, is within the souls of men. <!-- p. 115