Two quotable passages: 
"The more fully she understands who she teaches, the more aware she is that she must adapt what she teaches to serve individual learners well." (A Brief Primer on Differentiation, by Tomlinson) 
"Proactive differentiation, meaning that upfront before I finish planning my lesson, I am going try and have a sense of where the various kids are and what they need. And then i'm going to go into my classroom with two things or three things or four ways to try and get it done, and it's planned with matches of kids to avenues of getting somewhere." (Differentiation and Literacy; Tailoring Instruction).

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