Scripts vs. Programs
Couldn’t be put more simpler than this.
A script is what you give the actors. A program is what you give the audience.
– Larry Wall, the creator of Perl
So, do you know what programs written in scripting languages really are? 
Recurring Recursions
You’re on Step 2, which asks you to do Step 1?
In order to understand recursion, one must first understand recursion.
– Unknown, multiple sources
Stack overflow.
Smart Debugging
Damn!
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
– Brian W. Kernighan, the K in K&R C Book and AWK
Where would you draw the line?
Deficit Obviousness
There are two ways of constructing a software design: One way is to make it so simple that there are obviously no deficiencies and the other way is to make it so complicated that there are no obvious deficiencies.
– C.A.R. Hoare, the inventor of Quicksort
Obviously no deficiencies in understanding which way to choose.
Add your favorites in the comments, if you wish to.
