One of the saddest things in life, is the things one remembers.

As you yourself have said, what other explanation can there be?' Poirot stared straight ahead of him. 'That is what I ask myself,' he said. 'That is what I never cease to ask myself.

I often wonder why the whole world is so prone to generalise. Generalisations are seldom if ever true and are usually utterly inaccurate.

Everything must be taken into account. If the fact will not fit the theory---let the theory go.

There are some people who don't conform to the signals. An ordinary well-regulated locomotive slows down or pulls up when it sees the red light hoisted against it. Perhaps I was born color blind. When I see the red signal -- I can't help forging ahead. And in the end, you know, that spells disaster.

Speech ... is an invention of man's to prevent him from thinking.

To every problem, there is a most simple solution.