Secretary of State John Kerry testified before a House panel on Wednesday. (Carolyn Kaster/AP)

Secretary of State John Kerry kicked off a day of testimony on Capitol Hill Thursday with a tribute to those grieving in Boston at a service for the victims of the bombings at the Boston Marathon.

“It is no secret that my heart and head are in Boston today with the President and a lot of friends,” Kerry told his former colleagues on the Senate Foreign Relations Committee. He appeared emotional as he praised the “remarkable outpouring” of goodwill following the bombings, from runners who finished the marathon and ran to the hospital to donate blood, to the New York Yankees fans who honored Boston at a game on Tuesday.

And he vowed that next year’s marathon would be bigger and better. “We will celebrate that spirit,” he said.

Kerry’s week has been a Hill-centric one — he was in the House yesterday and will testify before the Senate Appropriations Committee this afternoon.