One man's constant is another man's variable. Structure data late in the programming process.
Syntactic sugar causes cancer of the semicolon.
Every program is a part of some other program and rarely fits. If a program manipulates a large amount of data, it does so in a small number of ways. It is easier to write an incorrect program than understand a correct one. A programming language is low level when its programs require attention to the irrelevant. It is better to have 100 functions operate on one data structure than 10 functions on 10 data structures.