John Legend is a pro when it comes to romance, but the birth of his daughter, Luna, taught him entirely new lessons about love.
"It's a different kind of love," the proud dad explained to Stephen Colbert on Tuesday's show. "It's very pure, it's unconditional, but they haven't earned it yet."
WATCH: EXCLUSIVE: John Legend Says Chrissy Teigen Is the Most Influential Person in His Life: 'She Makes Me Cooler'
He went on to quip, "They didn't do anything, they just exist and..."
"Right...but you love them completely," Colbert added.
"Yeah, you love them completely, but it's not like built on anything other than…" Legend said.
"Their existence," Colbert finished.
"Their existence!" Legend agreed.
The "Sure Fire" singer, 38, also opened up about the first time he held his daughter.
"Oh, it's beautiful, it's very emotional, and it brings you and your wife closer together," he said of his relationship with spouse, Chrissy Teigen. "It's a very like powerful feeling to see the product of your love right there in front of you."
Legend also revealed that being a parent has made him appreciate this own parents.
"Chrissy says, 'If they don't want to come have dinner with us when we're old and if they don't want to hang out or call us, I'm gonna be so sad.' We put so much love into this," he said.
WATCH: John Legend Opens Up About Chrissy Teigen's Postpartum Depression: 'We Have Challenges'
"It is never too early to guilt trip them!" Colbert suggested.
Legend also opened up to ET's Jennifer Peros at the Time 100 Gala on Tuesday about how Teigen makes him "cooler." To see the exclusive interview, watch the clip below!