Authors:

Time, as is well known, sometimes flies like a bird and sometimes crawls like a worm, but human beings are generally particularly happy when they don't notice whether it's passing quickly or slowly.

Ivan Sergeevich Turgenev, Elizabeth Cheresh Allen (1994). “The essential Turgenev”, Northwestern Univ Pr
Time, as is well known, sometimes flies like a bird and sometimes crawls like a worm, but human beings are generally particularly happy when they don't notice whether it's passing quickly or slowly.