“There must be something strangely sacred about salt. It is in our tears and in the sea”

Poem "Mar Português", Verses 1-2
Message
Original: Ó mar salgado, quanto do teu sal
São lágrimas de Portugal!

The Lost Son, ll. 32 - 35
The Lost Son and Other Poems (1948)

"The Deluge at Norderney"
Source: Seven Gothic Tales (1934)

III. 1, Line 12
The Progress of Poesy http://www.thomasgray.org/cgi-bin/display.cgi?text=pppo (1754)

Source: l8r, g8r

Presidency (1977–1981), Farewell Address (1981)
Context: We live in a time of transition, an uneasy era which is likely to endure for the rest of this century. During the period we may be tempted to abandon some of the time-honored principles and commitments which have been proven during the difficult times of past generations. We must never yield to this temptation. Our American values are not luxuries, but necessities— not the salt in our bread, but the bread itself.

Kéramos http://www.worldwideschool.org/library/books/lit/poetry/TheCompletePoeticalWorksofHenryWadsworthLongfellow/chap22.html, st. 3 (1878).
Context: Turn, turn, my wheel! All things must change
To something new, to something strange;
Nothing that is can pause or stay;
The moon will wax, the moon will wane,
The mist and cloud will turn to rain,
The rain to mist and cloud again,
To-morrow be to-day.

Source: Blackbird Singing: Poems and Lyrics, 1965-1999