This observation opens a passage in Tony Hoare’s essay “Hints on Programming-Language Design”. Before turning to programming, he states a general principle: across every field, from carpentry and golf to sculpture and space travel, the skilled practitioner is the one who understands their tools thoroughly.

Hoare’s purpose is to apply this idea to programmers. For him, the programming language is the programmer’s chief tool, and command of the craft depends on knowing it fully, including its rules, strengths and limitations. This connects to his broader argument that languages should be simple enough to be understood completely.

The wide range of examples underlines the claim’s generality. Hoare presents mastery of one’s instruments not as a narrow technical concern but as a common feature of expertise, whatever the trade or discipline. Understanding the tool, in his view, is inseparable from doing the work well.