It's an old cliché but things can change very quickly in football.
It was only on Saturday that David Luiz was named man of the match in Arsenal's 0-0 draw with Manchester United and lauded for his clenched-fist celebration of heading Bruno Fernandes' free kick away.
After the match Mikel Arteta was fielding questions about a potential contract extension for the Brazilian when his deal expires at the end of the season, and the Gunners boss refused to rule it out.
"No, there are still a few months to go on that," he said when quizzed on the possibility of a renewal.
"I all the time talk to him about this kind of thing so we’re in a good position."
Just three days later though that talk has evaporated and it's wake has come the latest controversial incident in his short Arsenal career.
The red card the Brazilian picked up against Wolves has certainly divided opinion, but what cannot be argued is the error he committed in the build up.
As Rui Patricio lobbed the ball forward to Willian Jose, Luiz was sucked in trying to win the ball high up the pitch even though both Granit Xhaka and Thomas Partey were in close attendance.
When he failed the left sided centre back space the Brazilian should have been was vacated and Wolves were able to easily work it through to Jose who ran into the box where the penalty was eventually given.
The fact that the contact between Luiz and Jose was so minimal does not change the fact that the defender was only scrambling back so desperately because of the naïve mistake he had made to be drawn out of position.
If a young defender like William Saliba for example had made this error then you could maybe forgive him, but at 33-years-of-age David Luiz has shown Arteta why it is probably time to move on.
Arteta has previously said he wants just four or five centre backs in his squad competing for places and it is becoming increasingly difficult to see where the Brazilian fits into that.
Pablo Mari and Gabriel have the left-sided centre half spot pretty much on lock going forward, while Rob Holding has been offered a contract extension on the right and William Saliba has been promised a future once his loan spell with Nice ends at the end of this season.
That is before you even mention Calum Chambers who is still within the squad or Dinos Mavropanos who is going from strength to strength during his loan at Stuttgart.
What does lie in Luiz's favour are his leadership qualities within Arsenal's young squad.
Bukayo Saka specifically singled out the influence of the Brazilian when announcing his own contract extension last July, while Mikel Arteta has stated his admiration for the role the former Chelsea defender plays in the dressing room.
"He’s a great example for them (Arsenal's youngsters)," said the Spaniard. "He’s got a good mixture with them between some banter and then some stick.
"They all listen to him because of who he is and what he’s done in the game. But also because how he behaves every day, how professional he is and how he goes about the job.
"He is one of the key role models that we have in our team."
But Arsenal must now decide whether the good outweighs the bad.
Regardless of what he's like on the training ground the reality is that he's given away six penalties and been sent off three times in the space of just one and a half seasons at the Emirates (even if the last one probably shouldn't have stood).
He would be at least 35 by the time a potential contract extension ends and as Mikel Arteta looks to the future, it is difficult to argue that David Luiz is it.
The Brazilian has been a good servant to Arsenal helping them to win a much-needed FA Cup last season, but after his latest mistake it is time for the Gunners to move on.
