“Mr Capriles, 40, is running against Mr Maduro to succeed the late leftist firebrand Hugo Chavez in April 14 elections.
“I feel that this fight… has become a spiritual struggle of a divine character, because those who live in Venezuela feel that this has become a struggle to break down a wall of evil,” Mr Capriles said.
Referring to his opponent’s camp, the Miranda state governor warned that “those who tell lies” and “use their power to blackmail or manipulate” the people “take the side of evil.”
“Those who believe in the truth… are on the side of good, and are those who want to defeat evil,” added Mr Capriles, as he repeated his criticism of the ruling party for abusing state resources to campaign.
The youthful governor lost October elections to Chavez, who died March 5 after losing a fight to cancer.