Vice President Joseph R. Biden Jr., in an emotional, wide-ranging interview onStephen Colbert’s “Late Show” on Thursday, expressed doubt about the likelihood that he would run for president, saying that “I’d be lying if I said that I knew I was there.”
Repeatedly touching on his parents, his faith and his emotional fragility from the recent death of his son Beau, Mr. Biden told Mr. Colbert that no “man or woman should run for president” without being able to promise voters that “you have my whole heart, my whole soul, my energy, and my passion.”
“Nobody has a right, in my view, to seek that office unless they are willing to give it 110 percent of who they are,” Mr. Biden told Mr. Colbert, on his third night hosting the CBS program.
…At Mr. Colbert’s urging, he also discussed religion and philosophy at length, describing his Roman Catholic faith as providing an “enormous sense of solace.” He attributed part of it to the rituals of his religion.
“I go to Mass, and I’m able to be just alone, even in a crowd,” Mr. Biden said. He recalled how his wife, Jill, once taped a note on his bathroom mirror with a quote from the philosopher Kierkegaard that said, “Faith sees best in the dark.”
There was one moment when Mr. Biden seemed to suggest where he might find the strength to run. He noted that his mother had a favorite expression: “As long as you are alive, you have an obligation to strive, and you’re not dead until you see the face of God.”

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UPDATE: CBS has posted the interview online. Part One, in which he discusses his faith (beginning at about 4:50), is below.

Biden discusses his faith and his future with Colbert—UPDATED WITH VIDEO