Bono described Seamus Heaney as "a great, great poet" who "changed my life".
"In so many things he was a gentle genius, whose words challenged us with the grit and beauty of life as much as they gave us solace. He wrote with a brevity that strangely spilled to the brim," he said.
"We all envied how he made that most complicated of things, the balancing of work and family, appear so simple. In Marie he found his other whole. And it is a joy to be around his kids. . . Michael, Chris and Catherine Ann. They have all of his humility in their sharpness."
And Bono revealed he carried Heaney's poetry with him, including on a recent trip to Liberia. "I'm bewildered to think Seamus is no longer with us. Because his words will be around forever, it seemed so would he."
Actor Liam Neeson also said: "He crafted, through his poetry, who we are as a species. By doing so, he defined our place in the universe. May he rest in peace."