The first time you do something, you just do it. The second time you do something similar, you wince at the duplication, but you do the duplicate thing anyway. The third time you do something similar, you refactor.

Refactoring: Improving the Design of Existing Code

For each desired change, make the change easy (warning: this may be hard), then make the easy change.

- Kent Beck

I’m not a great programmer; I’m just a good programmer with great habits.

- Kent Beck

Brevity is the soul of wit, but clarity is the soul of evolvable software.

Refactoring: Improving the Design of Existing Code

This is perhaps a reasonable hand-wavy definition of technical debt: things that “should” be done, but aren’t yet - the delta between our code and what we wish it was.

Software Engineering at Google