W. Somerset Maugham book The Moon and Sixpence
Source: The Moon and Sixpence (1919), Ch. 43, p. 154
William Somerset Maugham, CH , better known as W. Somerset Maugham, was an English playwright, novelist, and short story writer. He was among the most popular writers of his era and reputedly the highest-paid author during the 1930s.Both Maugham's parents died before he was 10, and he was raised by a paternal uncle who was emotionally cold. He did not want to become a lawyer like other men in his family, so he trained and qualified as a physician. The initial run of his first novel Liza of Lambeth sold out so rapidly that he gave up medicine to write full-time.
During the First World War, he served with the Red Cross and in the ambulance corps before being recruited in 1916 into the British Secret Intelligence Service, for which he worked in Switzerland and Russia before the October Revolution of 1917. During and after the war, he travelled in India, Southeast Asia and the Pacific, and those experiences were reflected in later short stories and novels. Wikipedia

W. Somerset Maugham book The Moon and Sixpence
Source: The Moon and Sixpence (1919), Ch. 43, p. 154
“It's very hard to be a gentleman and a writer.”
Source: Cakes and Ale: Or, The Skeleton in the Cupboard (1930), p. 157
"The promise", p. 407
Short Stories, Collected short stories 1
“Passion doesn't count the cost. … Passion is destructive.”
W. Somerset Maugham book The Razor's Edge
p, 125
The Razor's Edge (1943)
"The pool", p. 123
Short Stories, Collected short stories 1
“I was astonished to see him in Baghdad, for I had an appointment with him tonight in Samarra.”
"Death" in Sheppey, Act III (1933)
Plays
W. Somerset Maugham book The Moon and Sixpence
Source: The Moon and Sixpence (1919), Ch. 2, p. 11
Vladimir Mayakovsky, The Cloud in Trousers
Misattributed
W. Somerset Maugham book The Summing Up
Source: The Summing Up (1938), p. 71
“The essence of the beautiful is unity in variety.”
Moses Mendelssohn, Briefe über die Empfindungen (1755)
Misattributed
“It was not till quite late in life that I discovered how easy it is to say: "I don't know."”
Source: A Writer's Notebook (1946), p. 258
Thomas Babington Macaulay, On John Dryden (1828)
Misattributed
“Tradition is a guide and not a jailer.”
W. Somerset Maugham book The Summing Up
Source: The Summing Up (1938), p. 223
“Money is the string with which a sardonic destiny directs the motions of its puppets.”
Quoted in Somerset Maugham (1980) by Ted Morgan
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 106
“The crown of literature is poetry.”
Matthew Arnold, Count Leo Tolstoi
Misattributed
“The love that lasts longest is the love that is never returned.”
Source: A Writer's Notebook (1946), p. 13
“…the future will one day be the present and will seem as unimportant as the present does now.”
W. Somerset Maugham book The Summing Up
Source: The Summing Up (1938), p. 51
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 68
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 88
"The judgement seat", p. 314
Short Stories, Collected short stories 1
“Like all weak men he laid an exaggerated stress on not changing one's mind.”
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 39
“A soul is a troublesome possession, and when man developed it he lost the Garden of Eden.”
Red http://books.google.com/books?id=6ZZgZw5yX8QC&q="a+soul+is+a+troublesome+possession+and+when+man+developed+it+he+lost+the+Garden+of+Eden"&pg=PA413#v=onepage (1921)
"1896", p. 28
A Writer's Notebook (1946)
“Old age is ready to undertake tasks that youth shirked because they would take too long.”
W. Somerset Maugham book The Summing Up
Source: The Summing Up (1938), p. 290
“The writer is more concerned to know than to judge.”
W. Somerset Maugham book The Moon and Sixpence
Source: The Moon and Sixpence (1919), Ch. 41, p. 140
“Money is like a sixth sense - and you can't make use of the other five without it.”
NY Times Magazine (October 18, 1958)
“There's always one who loves and one who lets himself be loved.”
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 71
“To eat well in England, you should have a breakfast three times a day.”
Quoted in Somerset Maugham (1980) by Ted Morgan
“Sentimentality is only sentiment that rubs you up the wrong way.”
"1941"
A Writer's Notebook (1946)
“I don't think of the past. The only thing that matters is the everlasting present.”
W. Somerset Maugham book The Moon and Sixpence
Source: The Moon and Sixpence (1919), Ch. 21, p. 79
Arnold, in The Circle: A Comedy in Three Acts (1921), p. 58-59
Plays
“…when you are young you take the kindness people show you as your right…”
Source: Cakes and Ale: Or, The Skeleton in the Cupboard (1930), p. 166
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 122
“You bloody fool, you've killed the wrong man.”
The Hairless Mexican (1927)
Short Stories
“It is unsafe to take your reader for more of a fool than he is.”
W. Somerset Maugham book Ten Novels and Their Authors
Ten Novels and Their Authors (1954)
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 10
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 88
W. Somerset Maugham book The Summing Up
Source: The Summing Up (1938), p. 297
“Passion is destructive; if it does not destroy, it dies.”
W. Somerset Maugham book The Razor's Edge
The Razor's Edge (1943)
“Men seek but one thing in life — their pleasure.”
W. Somerset Maugham book Of Human Bondage
Source: Of Human Bondage (1915), Ch. 45
W. Somerset Maugham book The Moon and Sixpence
Source: The Moon and Sixpence (1919), Ch. 33, p. 119
Leo Tolstoy and War and Peace
Great Novelists and Their Novels
"The lion's skin", p. 283
Short Stories, Collected short stories 1