Theory and practice complement each other well

"Those who are enamored of practice without theory are like a pilot who goes into a ship without rudder or compass and never has any certainty where he is going. Practice should always be based upon a sound knowledge of theory" -Leonardo da Vinci

"There are people who prefer to anchor themselves in the comfort of a limited level of knowledge. They consider themselves practical and 'real-world'-ish" -Andrei Alexandrescu