The 24-year-old has produced both solid displays as well as the odd eccentric performance following his ?21million move to Stamford Bridge from Benfica just over a year ago.
But as Chelsea look to replace the disappointment of letting a 3-0 lead slip against Manchester United last weekend with a positive result at Everton, Luiz insists meeting his own work ethic is all that matters, and told the club's official website: "I have been working in the same way as always, training at my best level."
He added: "Sometimes you get criticism, like I did, and recently I have been applauded for my work. As long as I can go home and lay down on my bed and have my conscience clear that I am doing an honest job, I am happy.
"The main thing is to continue working and maintaining the philosophy that the coach instructs.
"We have to do this, sometimes we are doing things that are great and not getting the results and sometimes we do things not so good and get the result.
"The main thing is to continue working hard and obviously we are not where we want to be at the moment, not fighting for first place, but we have to keep looking for victories and believe in ourselves until the end.
"There are games we have lost where we could have done better, but we can't change the past, we can only look to the future and know that we can do better and move up positions."
Owner Roman Abramovich was understood to have again attended training on Wednesday - this third recent visit to Cobham.
The club though have already denied any suggestion that manager Andre Villas-Boas was coming under increased scrutiny from the billionaire owner.
Source: PA
Source: PA