Quotes for anniversaries and events

Variant: If you’re brave enough to say goodbye, life will reward you with a new hello.

Pt. 1, ch. 11
Jean Louise (Scout) Finch
Source: To Kill a Mockingbird (1962)

Source: Hell's Angels: A Strange and Terrible Saga

1880s, The Scholar in a Republic (1881)

Statement portrayed as a quotation in a 1927 Reader's Digest article, this probably derives from traditions about Alexander lamenting at his father Philip's victories that there would be no conquests left for him, or that after his conquests in Egypt and Asia there were no worlds left to conquer.
Some of the oldest accounts of this, as quoted by John Calvin state that on "hearing that there were other worlds, wept that he had not yet conquered one."
This may originate from Plutarch's essay On the Tranquility of Mind, part of the essays Moralia: Alexander wept when he heard Anaxarchus discourse about an infinite number of worlds, and when his friends inquired what ailed him, "Is it not worthy of tears," he said, "that, when the number of worlds is infinite, we have not yet become lords of a single one?"
There are no more other worlds to conquer!
Variant attributed as his "last words" at a few sites on the internet, but in no published sources.
Disputed
Source: http://penelope.uchicago.edu/Thayer/E/Roman/Texts/Plutarch/Moralia/De_tranquillitate_animi*.html

Source: When You Come to a Fork in the Road, Take It!: Inspiration and Wisdom from One of Baseball's Greatest Heroes

Source: The Witch of Portobello (2007), p. 152.
Context: You are what you believe yourself to be.
Don't be like those people who believe in "positive thinking" and tell themselves that they're loved and strong and capable. You don't need to do that because you know it already. And when you doubt it — which happens, I think, quite often at this stage of evolution — do as I suggested. Instead of trying to prove that you're better than you think, just laugh. Laugh at your worries and insecurities. View your anxieties with humor. It will be difficult at first, but you'll gradually get used to it. Now go back and meet all those people who think you know everything. Convince yourself that they're right, because we all know everything, it's merely a question of believing.
Believe.

Diary (20 April, 1930), quoted in Afinado desconcerto (2002), p. 262
Context: Sometimes I start looking at the mirror and examining myself, feature by feature: eyes, mouth, shape of the forehead, eyelids curve, the face line... And this vulgar and hideous-looking, grotesque and miserable amalgam, would it know how to do verses? Oh, no! There is something else … but what? After all, why think? To live is to not know that one is living... Why don't I forget that I am living... to live?

Start where you stand, and work with whatever tools you may have at your command, and better tools will be found as you go along.
Source: Think and Grow Rich (1938), p. 127

Variant: And remember, the truth that once was spoken: To love another person is to see the face of God.
Source: Les Misérables