Spoilers up to 6x01
Not a hunter
Mary doesn't hunt anymore, but she'll always be a hunter.
There's no forgetting what she knows.
During the day, she lives the life she wants to live. She's a mom, she bakes pies, takes Dean to the park, takes Sammy for a stroll, cooks for John, cleans the house.
During the night, she lives the life she has to live. She checks wards, paints devils traps under rugs, plants hoodoo weeds, chants incantations, writes protection charms on her sons' bedrooms, lays salt on her front door, mumbles Latin under her breath. She has nightmares and wakes up screaming her parent's names.
There's no forgetting what she knows.
She is a hunter.
But she's not.
Azazel slips past her and she doesn't even notice. She's out of practice, she's not caught up, she's old and tired and she's not a hunter, not anymore.
When she opens her eyes and sees John, she knows.
She screwed up and she lost everything she ever wanted.
SPNSPNSPN
Sam doesn't hunt anymore, but he'll always be a hunter.
There's no forgetting what he knows.
During the day, he lives the life he wants to live. He's a college student, goes to class, studies for exams, reads in the library, works at a coffee shop, takes his girlfriend out, drinks with his friends.
During the night, he lives the life he has to live. He checks wards, paints devils traps under rugs, waters the hoodoo weeds Pastor Jim got him, chants incantations, writes protection charms on Jessica's car, accidently drops salt on entrances, studies Latin so he doesn't forget it. He has nightmares and wakes up screaming his brother's name.
There's no forgetting what he knows.
He is a hunter.
But he's not.
Brady slips past him and he doesn't even notice. He's out of practice, he's not caught up, he's older and tired and he's not a hunter, not anymore.
When he opens his eyes and sees Jessica, he knows.
He screwed up and he lost everything he ever wanted.
SPNSPNSPN
Dean doesn't hunt anymore, but he'll always be a hunter. There's no forgetting what he knows.
During the day, he lives the life he wants to live. He's husband and a dad, he takes Ben to school, watches Ben's soccer games, goes to work, helps Lisa with the dishes, kisses her forehead and watches a movie with her in their couch.
During the night, he lives the life he has to live. He checks wards, paints devils traps everywhere Lisa lets him, waters the hoodoo weeds Bobby got him, chants incantations, writes protection charms on Ben and Lisa's rooms, lays salt on doors and windows, studies Latin so he doesn't forget it. He has nightmares and wakes up screaming his brother's name.
There's no forgetting what he knows.
He is a hunter.
But he's not.
The djinn slips past him and he doesn't even notice. He's out of practice, he's not caught up, he's old and tired and he's not a hunter, not anymore.
When he opens his eyes and sees Sammy, he knows.
He screwed up and everything he wanted… he got it right back.