Restored all the original introductions for each tutorial part

Author: javiereguiluz

quick_tour/the_architecture.rst

@@ -1,9 +1,11 @@
 The Architecture
 ================
 
-The first three parts of this tutorial didn't look too deeply at the
-architecture of the framework. Because it makes Symfony2 stand apart from the
-framework crowd, let's dive into the architecture now.
+You are my hero! Who would have thought that you would still be here after the
+first three parts? Your efforts will be well rewarded soon. The first three
+parts didn't look too deeply at the architecture of the framework. Because it
+makes Symfony2 stand apart from the framework crowd, let's dive into the
+architecture now.
 
 Understanding the Directory Structure
 -------------------------------------

quick_tour/the_big_picture.rst

@@ -1,9 +1,12 @@
 The Big Picture
 ===============
 
-This first part will teach you how to develop a simple Symfony2 project in 10
-minutes! If you've used a web framework before, you should feel right at home
-with Symfony2. If not, welcome to a whole new way of developing web applications.
+Start using Symfony2 in 10 minutes! This chapter will walk you through some of
+the most important concepts behind Symfony2 and explain how you can get started
+quickly by showing you a simple project in action.
+
+If you've used a web framework before, you should feel right at home with
+Symfony2. If not, welcome to a whole new way of developing web applications.
 
 Installing Symfony2
 -------------------

quick_tour/the_view.rst

@@ -1,9 +1,11 @@
 The View
 ========
 
-In this second part, you will learn more about `Twig`_, the fast, flexible,
-and secure template engine for PHP. Twig makes your templates more readable and
-concise; it also makes them more friendly for web designers.
+After reading the first part of this tutorial, you have decided that Symfony2
+was worth another 10 minutes. In this second part, you will learn more about
+`Twig`_, the fast, flexible, and secure template engine for PHP. Twig makes your
+templates more readable and concise; it also makes them more friendly for web
+designers.
 
 Getting familiar with Twig
 --------------------------