Mary: Sheldon, faith means believing in something you can't know for sure is real. And right now, I am struggling with that.
Sheldon: So you don't believe in God anymore?
Mary: That isn't something for you to worry about. I need to figure this out myself.
Sheldon: Can I help? Maybe I could provide a fresh perspective.
Mary: I don't think so, baby.
Sheldon: Did you know that if gravity were slightly more powerful, the universe would collapse into a ball?
Mary: I did not.
Sheldon: Also, if gravity were slightly less powerful, the universe would fly apart and there would be no stars or planets.
Mary: Where you going with this, Sheldon?
Sheldon: It's just that gravity is precisely as strong as it needs to be. And if the ratio of the electromagnetic force to the strong force wasn't one percent, life wouldn't exist. What are the odds that would happen all by itself?
Mary: Why are you trying to convince me to believe in God? You don't believe in God.
Sheldon: I don't, but the precision of the universe at least makes it logical to conclude there's a creator.
Mary: Baby, I appreciate what you're trying to do, but logic is here. And my problem is here.
Sheldon: Well, there are 5 billion people on this planet and you're the perfect mom for me. What are the odds of that?

Principal Petersen: Our next young speaker needs no introduction, but that didn't stop him from writing one and making me read it. [laughter] "Fun fact." [audience groans, murmurs] I hear you. "The word 'valedictorian' is from the Latin 'valedicere,' meaning 'to say farewell.' It is primarily used in the United States, Canada, the Philippines and Armenia." Maybe that fact's more fun in Armenia. Please welcome your valedictorian, Sheldon Cooper.
Mary: Yay, Shelly!
Sheldon: Hello. I'm not very comfortable speaking in front of crowds. But there's a technique to reduce stage fright by focusing on one person in the audience and delivering your speech just to them. That's what I'll be doing today. If it weren't for this person, I wouldn't be here right now. They've taught me a lot, and it's by their example that I found the courage to move forward into this new and exciting chapter of my life. Missy... ...this is for you. Change can be scary, but I know we're going to be fine... ...because like you said, "It's okay to be scared. We just have to do it anyway." So if any of my fellow graduates are nervous about the future, know that you're not alone. I suggest you all try to be as brave as my twin sister. That's my plan. Missy, I wish I could give you advice about middle school, but I was so smart, I skipped it. If you make it to high school, we'll talk. Thank you. [applause]

[Church board says "Jesus Exorcises Every Day."]
Sheldon: Did you write that?
Mary: You betcha.
Sheldon: Instead of puns, have you considered composing a humorous palindrome? It's a phrase that reads the same backwards as forwards. For example, "Do geese see God?" Trust me. Both ways.
Mary: Come inside.
Sheldon: Some other good ones are radar, level, kayak. That's a funny word. Kayak. Never get me in one.

Sheldon: Do people know about this?
Meemaw: Sheldon, what's on a person's face is not always what's in their heart.
Sheldon: Well, this changes everything. How do you know who to trust?
Meemaw: You don't. That's what makes life interesting.

Adult Sheldon: I didn't realize until years later that my father was only asking questions about lightning and thunder to cheer me up. In fact, he would often pretend to be dumb just to make me feel better.

George Jr.: What are you doing?
George Sr.: Separating the whites from the colors.
George Jr.: Whoa, that's racist.

Missy: Hey, Dean, want to help me roll out the dough?
Dean: Yeah, one second, I'm just helping Grandma grease the pan.
Meemaw: Who?
Dean: Oh, uh, sorry. You just remind me of my grandma.
Meemaw: I tell you what, why don't you help Missy, and I'm gonna start the dishes.
Dean: Oh, uh, while the cookies are baking, maybe you could teach me how to play gin rummy.
Missy: All right, we're done here.
Dean: What?
Missy: You heard me.
Dean: Are you breaking up with me?
Missy: Yeah. You can go now.
Dean: But my mom's not picking me up till 7:00.
Meemaw: Oh, I'll get the cards. [Missy sighs]

Principal Petersen: George, you crazy son-of-a-bitch, I can't believe you pulled that off!
George Sr.: Me, neither.
Pastor Rob: Looks like we make a pretty good team, George.
[As Pastor Rob celebrates with the team, a glum George stands still. Two players walk up and dump a container of sports drink over George.]

George Sr.: [to Pastor Rob] I don't want to tell you how to do your job, but if I was a prayin' man, I'd start now.