If it is not possible to step into the same river twice, then it is not possible to make the same mistake twice. Instead, what appears to be the same mistake, will be a different mistake.

Is avoiding procrastination a different form of procrastination? Procrastination assigns higher priority to tasks that you want to do (but don't need to do) than to tasks that you need to do (but don't want to do), and acts accordingly. Is it possible to want to do things that you need to do? The want pulls more than the need pushes, and the want wins. I prefer walking downhill to running uphill.

Creating complex solutions to simple problems can provide the foundation for the production of more complex problems which may not have simple solutions. Productivity is proportional to the number of problems solved, inversely proportional to the effort to solve a problem, and inversely proportional to the number of problems created by the solution. This could be related to the measure twice, cut once concept.

What does it mean for an application user interface to be "responsive" while some task is being executed? It means that the application is still able to process input events, i.e. to react to user input. Depending on the task being executed, some input events may be ignored (for example, by disabling the part of the UI responsible for launching the task, until the task is complete and another one can be submitted). Some input events must not be ignored (for example, being able to close the application, or to interrupt the task).

If the unexamined life is not worth living, the examined life not necessarily is either, but the evaluation is needed to establish worthiness. Can zombies be passionate about their zombie existence? Should every day be rated on a scale from 1 to 7, where 1 is Monday and 7 is Friday?

The perfect balance lies exactly between the extremes of too little and too much. Instead of doing everything now, or doing nothing never, you do something now and then.