I know if I missed a day and ...

I know if I missed a day and nothing happened, then it would be much easier to miss another day. Pretty soon I wouldn’t have much of a schedule, and then I'd have less motivation. It's a downward spiral that I want to avoid, so I keep the schedule sacred.
 Chris Guillebeau

Quotes from the same author

Instead of reflecting on the past, predict the future.
 Chris Guillebeau
Never despise small beginnings, and don't belittle your own accomplishments. Remember them and use them as inspiration as you go on to the next thing. When you venture outside your comfort zone, wherever the starting point may be, it's kind of a big deal.
 Chris Guillebeau
If you want to achieve the unimaginable, you start by imagining it.
 Chris Guillebeau
Courage comes through achievement, but also through the attempt.
 Chris Guillebeau
In the long-term, security comes from an asset you create or acquire, not a position in someone else's asset.
 Chris Guillebeau