“The ocean has been singing to me, and the song is that of our life together…”

Although it appears on U.S. postage featuring Angelou, this is actually a variant quote from the work of poet Joan Walsh Anglund.
Misattributed
Source: Postal Service releases Maya Angelou stamp with quote from another author, Josh Hicks, 7 April 2015, Washington Post, 9 April 2015 http://www.washingtonpost.com/blogs/federal-eye/wp/2015/04/07/postal-serves-releases-maya-angelou-stamp-with-quote-from-another-author/,

Love's Voice (c.1935–1939)
Context: Such fable ours! However sweet,
That earlier hope had, if fulfilled,
Been but child's pap and toothless meat
— And meaning blunt and deed unwilled,
And we but motes that dance in light
And in such light gleam like the core
Of light, but lightless, are in right
Blind dust that fouls the unswept floor

For, no: not faith by fable lives,
But from the faith the fable springs
— It never is the song that gives
Tongue life, it is the tongue that sings;
And sings the song. Then, let the act
Speak, it is the unbetrayable
Command, if music, let the fact
Make music's motion; us, the fable.

The quote has been misattributed to Maya Angelou at times, including on U.S. postage.
This quote by Joan Walsh Anglund (1967 in her book, A Cup of Sun) has been widely used by Maya Angelou without attribution to Walsh Walsh Anglund, and wrongly misattributed to Maya Angelou many, many times, including on U.S. postage. However, the quote belongs to Joan Walsh Anglund, and is from her book "A Cup of Sun" published in 1967. However, Maya Angelou changed the pronoun "He" to "It" but quoted everything else of Joan Walsh Anglund. Why Maya Angelou never attributed her most famous quote as being Joan Walsh Anglund's is still a mystery to this day.
Source: A Cup of Sun: A Book of Poems (1967)

Source: Uprooted

Introducing "Who by Fire"
Warsaw concert (1985)
Context: I come from a country where we do not have the same struggles as you have. I respect your struggles. And it may surprise you, but I respect both sides of this struggle. It seems to be that in Europe there needs to be a left foot and a right foot to move forward. I wish that both feet move forward and the body moves towards its proper destiny. This is an intense country; the people are heroic, the spirit is independent. It is a difficult country to govern, it needs a strong government and a strong union. … I would like to say to you, to the leaders of the left, and the leaders of the right, I sing... I sing for everyone. My song has no flag, my song has no party. And I say the prayer, that we said in our synagogue, I say it for the leader of your union and the leader of your party. May the Lord put a spirit, a wisdom and understanding into the hearts of your leaders and into the hearts of all their counsellors.

From On Reading a Posthumous book Gillian Lindsay -Biography of Flora Thompson 1990 ISBN 9781873855539
Poetry

[Post Staff, http://www.phnompenhpost.com/national/recollections-king-father, Recollections of the King Father, 3 February 2013, 29 June 2015, Phnom Penh Post]

Source: The Name of the Wind