“Fear? What has a man to do with fear? Chance rules our lives, and the future is all unknown. Best live as we may, from day to day.”

God of Grace and God of Glory (1930)
Context: Lo! the hosts of evil ’round us,
Scorn Thy Christ, assail His ways.
From the fears that long have bound us,
Free our hearts to faith and praise.
Grant us wisdom, grant us courage,
For the living of these days,
For the living of these days.

Source: The Princess Diaries

Forge of Darkness (2013)

Google It: Total Information Awareness, 2016

At A Child's Grave (1882)
Context: The dead do not suffer. And if they live again, their lives will surely be as good as ours. We have no fear. We are all children of the same mother, and the same fate awaits us all.
We, too, have our religion, and it is this: Help for the living, hope for the dead.

Speech to the American Legion convention, New York City (27 August 1952); as quoted in "Democratic Candidate Adlai Stevenson Defines the Nature of Patriotism" in Lend Me Your Ears : Great Speeches In History (2004) by William Safire, p. 81

Following the Steelers win over the Rams in 2007, quoted in "Steelers Notebook: Turf wars — Natural or artificial at Heinz Field?" by Gerry Dulac in The Pittsburgh Post-Gazette (22 December 2007) http://www.post-gazette.com/pg/07356/843782-66.stm?cmpid=sports.xml

This is actually James Branch Cabell from The Silver Stallion (1926)
Misattributed

Credo (1901)
Context: I believe in the Motherhood of God.
I believe in the Blessed Trinity of Father, Mother and Child.
I believe that God is here, and that we are as near Him now as ever we shall be.
I do not believe He started this world a-going and went away and left it to run by itself.
I believe in the sacredness of the human body, this transient dwelling place of a living soul, And so I deem it the duty of every man and every woman to keep his or her body beautiful through right thinking and right living.
I believe that the love of man for woman, and the love of woman for man is holy; And that this love in all its promptings is as much an emanation of the Divine Spirit as man's love for God, or the most daring hazards of the human mind.
I believe in salvation through economic, social, and spiritual freedom.
I believe John Ruskin, William Morris, Henry Thoreau, Walt Whitman, and Leo Tolstoy to be Prophets of God, who should rank in mental reach and spiritual insight with Elijah, Hosea, Ezekiel, and Isaiah.
I believe that men are inspired to-day as much as ever men were.
I believe we are now living in Eternity as much as ever we shall.
I believe that the best way to prepare for a Future Life is to be kind, live one day at a time, and do the work you can do best, doing it as well as you can.
I believe we should remember the Week-day, to keep it holy.
I believe there is no devil but fear.
I believe that no one can harm you but yourself.
I believe in my own divinity — and yours.
I believe that we are all sons of God, and it doth not yet appear what we shall be.
I believe the only way we can reach the Kingdom of Heaven is to have the Kingdom of Heaven in our hearts.
I believe in every man minding his own business.
I believe in sunshine, fresh air, friendship, calm sleep, beautiful thoughts.
I believe in the paradox of success through failure.
I believe in the purifying process of sorrow, and I believe that death is a manifestation of life.
I believe the Universe is planned for good.
I believe it is possible that I shall make other creeds, and change this one, or add to it, from time to time, as new light may come to me.