A few things that I take:
- Excessive constraint limits innovation.
- Consistency is the hobgoblin of little mind. (from R.W.Emerson)
- Fearmongers assumes the worst of everyone.
- Idealogy is mostly tribalism.
- Programming is not just science but also human language.
In summary, he suggested trying your own things in your own way without fearing too much. We learn with failure and play. Creativity and innovation actually follow them.