No tool works perfectly in every context, and much grief visits projects who try to use tools outside their expiration date.

~ Neal Ford

The less code does the more valuable it is

~ Nat Pryce

Those who think software construction should be just like building construction are clearly unskilled at both. 

~ Andy Hunt

Encapsulation picks up where abstraction leaves off. Abstraction says, "You're allowed to look at an object at high level of detail." Encapsulation says, "Furthermore, you aren't allowed to look at an object at any other level of detail."

~ Steve McConnell