A highly-rated talent, not only has Kubica targeted a return before the end of 2011 but he said he also wants to come back a better driver.
"I want to return stronger than before," said Kubica, who has had serious accidents in the past, requiring surgery to his left arm after being a passenger in a road accident in 2003, and then missing the 2007 United States Grand Prix after a serious crash in Canada.
"After this accident, you are no longer the same, you are better.
"I had already gone through that in 2007 after the crash in Canada.
"I was out for one race and when I came back I was better. A driver is not just about accelerating and steering.
"There is a difference between those that drive at 85% and those that drive at 95%. The 15% remaining is the capacity and motivation that comes out of you.
"Since 2007, I'm a stronger driver and I'm stronger mentally. It will be the same this time when I recover physically."
Kubica said he was still trying to piece together the sequence of events that led to his accident, where a guard-rail penetrated the front of his car, causing his injuries.
When he arrived in hospital he had only one litre of blood. "Call the boy's parents," the doctors told me on Sunday afternoon. I felt a chill in my spine
Kubica's agent Daniele Morelli
"I really don't know what happened because I don't remember anything of the accident," Kubica explained.
"I just found myself in hospital and my agent Daniele Morelli has explained everything to me.
"I am saddened with what has happened. It should not have happened.
"I am sorry for my mother because I have made her worry and suffer.
"One does this job but never thinks of the consequences. I just know that I did the rally and now I am in this bed."
Morelli added: "When he arrived in hospital he had only one litre of blood. 'Call the boy's parents', the doctors told me on Sunday afternoon. I felt a chill in my spine."
Renault team principal Eric Boullier told BBC Sport that Kubica was understandably down about his accident and injuries but claimed it was still too soon to say for certain that he will miss the whole season.
"All I know for now is that for the next three months for sure he won't be back. After that, it could be four, five, six," said Boullier.
"He needs at least three months to recover physically, and then we see."
Kubica had shown excellent early-season form after
topping the fastest times
in the first testing session in Valencia last week in Renault's new R31.
After the accident, Red Bull's Mark Webber sent his best wishes to Kubica.
"It was a big shock for all of us, I couldn't believe it," said the Australian.
"I'm happy, as it looks like the people involved have done an incredible job for him after the accident to keep him in the best shape possible.
"It's a big loss for our sport that he's not here this year and a big loss for us as competitors, as we're motivated to race against the best guys in the world and Robert is one of them.
"I wish him all the best for his recovery; every day he'll make progress and I'm looking forward to having him back when he is ready."
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