Related:

• This species has amused itself to death.
• I've sometimes thought of marrying - and then I've thought again.
• Science itself, therefore, may be regarded as a minimal problem, consisting of the completest possible presentment of facts with the least possible expenditure of thought.
  -- Ernst Mach...
• When the mind is thinking, it is talking to itself.
• Come of it what may, as Sinon said. -- Phaedrus (c. 8 A.D.) -- Book iii, The Prologue, 27
• So good it's better than itself.
• An inexhaustible good nature is one of the most precious gifts of heaven, spreading itself like oil over the troubled sea of thought, and keeping the mind smooth and equable in the roughest weather.
  -- Washington Irving...
• A mind not to be chang'd by place or time. The mind is its own place, and in itself Can make a Heaven of Hell, a Hell of Heaven.
  What matter where, if I be still the same, And what I should be, all but less than he Whom thunder hath made greater?...
• PHILISTINE, n. One whose mind is the creature of its environment, following the fashion in thought, feeling and sentiment.
  He is sometimes learned, frequently prosperous, commonly clean and always solemn....