Thomas Piketty

Economists should be modest and be aware that they are part of the broader social science community. We need to be pragmatic about the methods we use. When we need to do history, we should do history. When we need to study political science, we should study political science.

I would absolutely recommend against excessive positivity and optimism. Any positive emotion that you're infusing into a workplace needs to be grounded in reality. If it's not realistic, sincere, meaningful, and individualized, it won't do much good.