Elon Musk, 2 August 2006

So, in short, the master plan is:

1. Build sports car

2. Use that money to build an affordable car

3. Use that money to build an even more affordable car

4. While doing above, also provide zero emission electric power generation options

Don't tell anyone.

Elon Musk, 20 July 2016

So, in short, Master Plan, Part Deux is:

Create stunning solar roofs with seamlessly integrated battery storage
Expand the electric vehicle product line to address all major segments
Develop a self-driving capability that is 10X safer than manual via massive fleet learning
Enable your car to make money for you when you aren't using it