• The phone call between Hotch and Gideon when he can't choose the most beautiful flowers for Sarah.

• When Hotch profiles Erin Strauss and then his team (see best lines).
  

• Gideon: "Do you have a yellow flower? They’re like, uh, they’re little yellow flowers… They look like dandelions, or like weeds – but they’re not weeds… They have a little black spot in the middle, but they don’t have a black spot… They’re sort of round and puffy?"
  Sammy: "Button mums."
  Gideon: "Do you have those? Can I see what those are?"

• Gideon: "Hotch, You're the best unit chief I know."
  Hotch: "Jason, I'm the only unit chief you know."

• JJ: (At apartment door, guns drawn) "No matter what happens this time, we don't split up, clear?"
  Reid: "Crystal."

• (Hotch and Prentiss waiting for Gideon at the train station)

Hotch: "He'll be here."
Prentiss: "In what capacity?"
Hotch: "What's that supposed to mean?"
Prentiss: "As an agent or an executioner?"
Hotch: "..."

• (With Frank on the train station)

Gideon: "You took the lives of hundreds... All because your mother was a whore?!"
...
Gideon: "You're not a rare bird, Frank. Nothing special about you. Common, pedestrian, boring..."
Frank: (turns to Jane) "Jane, this world - we don't fit in it. No one understands what we are."
Gideon: "Jane, he sees you as his mother. Nothing more, nothing less."

• Hotch: “The modern furniture, the strategically placed magazines, the framed diplomas, the art on the wall are all in conflict with your family photos. You have three children, but you favour the middle one - your son."

Erin: (interrupts) “What do you think you're doing?
Hotch: (continues) “Of course you love all your children, but not like your son...”
Erin: "That's enough!"
Hotch: "The bonsai you obsessively nurture is to compensation for feelings of failure as a mother."
Erin: "Agent Hotchner! I said that is enough. My position is not in question here. As your superior, I am questioning your ability to lead your team."
Hotch: "My team? Let me tell you about my team. Agent Morgan fought to protect his identity from the very people who could save him. Why? Because trust has to be earned, and there are very few people he truly trusts. Reid’s intellect is a shield which protects him from his emotions and, at the moment, his shield is under repair. Prentiss overcompensates because she doesn’t yet feel she’s a part of the team. She needn’t worry. Every day, Agent Jareau fields dozens of requests for our team and every night she goes home hoping she’s made the right choices. Garcia fills her office with figurines and color to remind herself to smile as the horror fills her screens and Agent Gideon in many ways is damned by his profound knowledge of others, which is why he shares so little of himself yet he pours his heart into every case we handle. I stand by my actions and I stand by my team, and if you think that you can find a better person for the job, good luck."
Erin: "Agent Hotchner..."
Hotch: "How do I know you favor your son? I'm good at my job!"

• Music of Season 2
  

• Writers & Directors for Season 2