Related:

• Life is difficult because it is non-linear.
• The study of non-linear physics is like the study of non-elephant biology.
• A pain in the ass of major dimensions. -- C.A. Desoer, on the solution of non-linear circui
• Demo: A method of program testing that tends to isolate numerous non-reproducible program behaviors.
  Fixing said abnormalities is difficult because they only appear when the debugging software is not loaded, and when severeal potential buyers are watching....
• It is difficult for sorrow to intrude on a busy life.
• Life is both difficult and time consuming.
• Life is difficult. -- M. Scott Peck