A jury last year found Anthony Lee Kay guilty of attempting to murder acquaintance Matthew Kalevi Dauncey on July 23, 2009.
Kay was sentenced in the Supreme Court in Brisbane today.
The court heard Kay had been assaulted earlier in the day and thought Dauncey was responsible.
When he went to Dauncey's house at Acacia Ridge in Brisbane's south to buy drugs from him, Kay attacked him from behind with a knife, stabbing him in the base of the skull several times and once in the stomach.
Kay then left Dauncey's house and called an ambulance for himself, leaving Dauncey to deal with his stab wounds on his own.
Prosecutor Maita Aylward said Kay had a low intelligence and was unable to control his anger, making him a danger to society.
However, defence barrister Andrew Hoare told the court his client was sorry for his actions and his intellectual barrier should count as a mitigating factor.
Mr Hoare argued Kay's sentence should be between 10 and 12 years.
However, Justice James Douglas told Kay he was too big a risk to the community, particularly given his criminal history.
"You only stopped when the complainant was able to get the knife from you," he told Kay.
"There was also a lack of remorse on the night when you left the complainant with stab wounds and called an ambulance for yourself."
Justice Douglas sentenced Kay to 14 years behind bars and took 915 days already served in pre-sentence custody into account.
As a serious violent offender, Kay will be required to serve at least 80 per cent of his sentence.
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