"I do so without hesitation", Kidd said, noting that Pell was a figure of authority.
Pell, who was until late-February the Vatican's treasurer, is the highest-ranking Catholic to be convicted and jailed for child sexual abuse.
However, the court's chief judge, Peter Kidd, responded by saying he was not convinced by those arguments, saying Pell had engaged in "callous, brazen offending" against two boys in a room with an open door, causing trauma and distress.
Pell maintained his innocence throughout and has filed an appeal, which is set to be heard in June.
Pell was found guilty of five charges: one charge of sexual penetration of a child and four of indecent acts with a child, each carry a 10-year maximum jail sentence.
The victim said a jury unanimously accepted the truth of his evidence, after several days of testimony and cross-examination by Pell's defence.
While awaiting sentencing, prisoners, for the most part, keep their civilian clothes, but now Pell's belongings will be taken and he will be given a green prison tracksuit for the first time.
"Being a witness in a criminal case has not been easy".
During the trial the victim described how Pell had exposed himself to them, fondled their genitals and masturbated and forced one boy to perform an oral sex act on him. Pell was found guilty of five counts of sexual assault, in two separate incidents in the late 90s, in December.
One of the victims released a statement through their lawyer, saying it was hard to fully digest the sentencing and that Pell's anticipated appeal clouded the moment.
"Your obvious status as Archbishop cast a powerful shadow over this offending", he said.
"You were confident your victims would not complain".
The judge also took pains to note that he was sentencing Pell for the offenses on which the cardinal had been convicted - and not for the sins of the Catholic Church.
County Court of Victoria Chief Judge Peter Kidd said there was a real possibility that at the age of 77, Cardinal Pell could spend the rest of his life in prison.
"I'm imposing a sentence on Cardinal Pell for what he did".
Warning: this article discusses sexual and child abuse.
"As I directed the jury who convicted you in this trail, you are not to be made a scapegoat for any failings or perceived failings of the Catholic Church", Kidd said.
"The acts were sexually graphic". He will have a non-parole period of three years and eight months.
"I hope that justice prevails and that Mr George Pell is treated like every other pedophile and sex offender in this state and he is incarcerated for a sentence that is appropriate to the crime that he committed", Sheedy told 3AW radio.
"Despite this, you still indecently acted against (the boy), and did so with what I consider to be a degree of physical aggression and venom", Judge Kidd said.
Cardinal Pell's sentencing was shown live on television, reflecting the high level of interest in the case, although only the judge was shown and the broadcast was cut immediately after the sentence was delivered.
The royal commission was critical of Pell's predecessor in Melbourne, Archbishop Frank Little, who died in 2008.