“This I believe with all my heart.”
This I Believe (1952)
Context: I believe in — I am proud to belong to — the United States. Despite shortcomings, from lynchings to bad faith in high places, our nation has had the most decent and kindly internal practices and foreign policies to be found anywhere in history.
And finally, I believe in my whole race. Yellow, white, black, red, brown — in the honesty, courage, intelligence, durability … and goodness …. of the overwhelming majority of my brothers and sisters everywhere on this planet. I am proud to be a human being. I believe that we have come this far by the skin of our teeth, that we always make it just by the skin of our teeth — but that we will always make it … survive … endure. I believe that this hairless embryo with the aching, oversize brain case and the opposable thumb, this animal barely up from the apes, will endure — will endure longer than his home planet, will spread out to the other planets, to the stars, and beyond, carrying with him his honesty, his insatiable curiosity, his unlimited courage — and his noble essential decency.
This I believe with all my heart.
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Robert A. Heinlein 557
American science fiction author 1907–1988Related quotes

“In my individual heart I fully believe my faith is as robust as yours.”
Letter to John Jay Chapman (5 April 1897)
1890s
Context: In my individual heart I fully believe my faith is as robust as yours. The trouble with your robust and full bodied faiths, however, is, that they begin to cut each others throats too soon, and for getting on in the world and establishing a modus vivendi these pestilential refinements and reasonablenesses and moderations have to creep in.

“If my mind can conceive it; and my heart can believe it — then I can achieve it.”
Similar to a quote by Jesse Jackson, which is in turn a modification of a quote by Napoleon Hill: "Whatever the mind of man can conceive and believe, it can achieve."
Misattributed
Source: The Soul of a Butterfly: Reflections on Life's Journey
http://www.kipmckean.org/wp-content/uploads/2007/01/Revolution_through_Restoration_1_2_3.pdf, Ending to Revoultion Through Restoration 1, 1992.
Revolution Through Restoration (1992-2002)

"Fidelity"
Begin to Hope (2006)
Context: I never loved nobody fully
Always one foot on the ground
And by protecting my heart truly
I got lost in the sounds
I hear in my mind
All these voices
I hear in my mind all these words
I hear in my mind all this music
And it breaks my heart
It breaks my heart...

Excerpt from a speech addressed to a pro-life group in Nashville, Tennessee — https://www.nbcnews.com/think/opinion/mike-pence-says-making-abortion-illegal-saves-lives-history-proves-ncna853031 (February 27, 2018)
Vice President of the United States (2017-Present)

Letter to Paul Dukas (1901)
Context: I confess that I am no longer thinking in musical terms, or at least not much, even though I believe with all my heart that Music remains for all time the finest means of expression we have. It’s just that I find the actual pieces — whether they’re old or modern, which is in any case merely a matter of dates — so totally poverty-stricken, manifesting an inability to see beyond the work-table. They smell of the lamp, not of the sun. And then, overshadowing everything, there’s the desire to amaze one’s colleagues with arresting harmonies, quite unnecessary for the most part. In short, these days especially, music is devoid of emotional impact. I feel that, without descending to the level of the gossip column or the novel, it should be possible to solve the problem somehow. There’s no need either for music to make people think! … It would be enough if music could make people listen, despite themselves and despite their petty mundane troubles, and never mind if they’re incapable of expressing anything resembling an opinion. It would be enough if they could no longer recognize their own grey, dull faces, if they felt that for a moment they had been dreaming of an imaginary country, that’s to say, one that can’t be found on the map.

What sort of show then do I already make in the sight of Almighty God, who sees every man exactly as he is?
P. 276.
Attributed, Dictionary of Burning Words of Brilliant Writers (1895)