Who said "I'm going to believe in myself."?

This quote is attributed to Jim Halpert.

I'm going to believe in myself. - Jim Halpert

"I'm going to believe in myself."

Jim Halpert

"I'm not superstitious, but I am a little stitious."

"That's what she said."

"You took me by the hand, made me a man."

"I'm in love. I don't know how it happened, but I'm in love with Pam."