“My dear, my better half”

Source: Reflected in You

Half of My Heart
Song lyrics, Battle Studies (2009)
Source: John Mayer - Battle Studies
Context: I was born in the arms of imaginary friends,
Free to roam, made a home out of everywhere I've been.
Then you come crashing in, like the realest thing,
Trying my best to understand all that your love can bring.Oh half of my heart's got a grip on the situation;
Half of my heart takes time.
Half of my heart's got a right mind to tell you
That I can't keep loving you (can't keep loving you)
Oh, with half of my heart.

Other Days, reported in Bartlett's Familiar Quotations, 10th ed. (1919).

1961, Speech to Special Joint Session of Congress
Context: Let it be clear — and this is a judgment which the Members of the Congress must finally make — let it be clear that I am asking the Congress and the country to accept a firm commitment to a new course of action — a course which will last for many years and carry very heavy costs: 531 million dollars in fiscal '62 — an estimated seven to nine billion dollars additional over the next five years. If we are to go only half way, or reduce our sights in the face of difficulty, in my judgment it would be better not to go at all.

Source: Hard-Boiled Wonderland and the End of the World (1985), Chapter 38, Escape

Source: Reflected in You

Letter to John Sterling http://digital.library.upenn.edu/women/carlyle/jwclam/lam101.html#LM1-5 (15 June 1835).