"It is the spirit of the game, not the letter of the rules, which is important. Never hold to the letter written, nor allow some barracks room lawyer to force quotations from the rule book upon you, if it goes against the obvious intent of the game. As you hew the line with respect to conformity to major systems and uniformity of play in general, also be certain that the game is mastered by you and not by your players...you are the creator and final arbiter."
- Gary Gygax, Afterword from the 1st edition DMG
These words hold true for (nearly?) all role-playing games, not just Advanced Dungeons & Dragons. Rest well, Gary. You are missed.