Came here to post this one. No single book my entire career has helped me more. It's a toolbox full of tools. How you use those tools is up to you. A hammer

Came here to post this one. No single book my entire career has helped me more. It's a toolbox full of tools. How you use those tools is up to you. A hammer can be used to build a house, or crush a skull. Two very different outcomes depending on the intent of the person wielding the tool.