Duplication is far cheaper than the wrong abstraction.

Sandi Metz, RailsConf 2014

Deleting unused code saves money right now.

Sandi Metz, Practical Object-Oriented Design in Ruby

Anything that works will be used in progressively more challenging applications until it fails.

The Generalized Peter Principle

Work expands so as to fill the time available for its completion.

Parkinson’s Law

How easy it is to make people believe a lie, and how hard it is to undo that work again!

Mark Twain, Autobiography of Mark Twain, Volume 2

It is not that we have so little time but that we lose so much. … The life we receive is not short but we make it so; we are not ill provided but use what we have wastefully.

Seneca the Younger, De Brevitate Vitæ [ On the shortness of life ]

Excellence is an art won by training and habituation: we not act rightly because we have virtue or excellence, but rather have these because we have acted rightly; these virtues are formed in man by doing his actions; we are we repeatedly do. Excellence, then, is not an act but a habit.

Will Durant, The Story of Philosophy (1926)