“There's perfect harmony
In the rising and the falling of the sea.
And as we sail along,
I never fail to be astounded by
The things we'll do for promises
And a song.”

Everyone
Song lyrics, Moondance (1970)

This saying appears to be due to John Augustus Shedd; it was quoted in "Grace Hopper : The Youthful Teacher of Us All" by Henry S. Tropp in Abacus Vol. 2, Issue 1 (Fall 1984) ISSN 0724-6722 . She did repeat this saying on multiple occasions, but she called it "a motto that has stuck with me" and did not claim coinage. Additional variations and citations may be found at Quote Investigator http://quoteinvestigator.com/2013/12/09/safe-harbor/
Misattributed

Go Rin No Sho (1645), The Ground Book
Context: There is timing in the whole life of the warrior, in his thriving and declining, in his harmony and discord. Similarly, there is timing in the Way of the merchant, in the rise and fall of capital. All things entail rising and falling timing. You must be able to discern this. In strategy there are various timing considerations. From the outset you must know the applicable timing and the inapplicable timing, and from among the large and small things and the fast and slow timings find the relevant timing, first seeing the distance timing and the background timing. This is the main thing in strategy. It is especially important to know the background timing, otherwise your strategy will become uncertain.

Turmel vows to stay on until NDP chooses leader http://www.cbc.ca/news/politics/story/2011/08/23/pol-ndp-turmel.html August 23, 2011.

The first line is often misquoted as "I must go down to the seas again." and this is the wording used in the song setting by John Ireland. I disagree with this last point. The poet himself was recorded reading this and he definitely says "seas". The first line should read, 'I must down ...' not, 'I must go down ...' The original version of 1902 reads 'I must down to the seas again'. In later versions, the author inserted the word 'go'.


Source: https://poemanalysis.com/sea-fever-john-masefield-poem-analysis/
Salt-Water Ballads (1902), "Sea-Fever"

Variant: Our greatest glory consists not in never falling, but in rising every time we fall.
Source: The Citizen of the World, Or, Letters from a Chinese Philosopher, Residing in London, to His Friends in the Country, by Dr. Goldsmith

Source: Deep Wizardry

1990s, Long Walk to Freedom (1995)

Quotations from Gurudev’s teachings, Chinmya Mission Chicago