Less than a week after suffering a heart attack, Sen. Bernie Sanders (I-Vt.) addressed hundreds of campaign staffers on Monday afternoon to offer his gratitude for their work and assure them he is more committed than ever to winning the Democratic presidential nomination.

Ironically, I will tell you that I feel more strongly about the need for a political revolution today than I did when I began, he said, according to the campaign.

The mood amongst the staffers who were on the brief call was boisterous, according to three people who were on the call who requested anonymity to speak without authorization.

One of the campaign aides described being moved by Sanders reminder that their campaign which boasts the slogan, Not me. Us. was about the hopes and dreams of millions of working people seeking a better life.

You work so fucking hard on these things, that its good to hear the person you work for have this really kind of humbling approach to it all, the aide said. He said Dont take your eye off the ball in a way that really got people moving.

The call embodied the broader response that the campaign has had since Sanders was hospitalized late Tuesday night with chest pain that ended up being a myocardial infarction, or heart attack: That Sanders is well on his way back to full health, that his fight for Medicare for All is more personal than ever, and that he has no plans to slow down his campaign.

The working class Americans who are the core of Bernies movement wake up each day and battle adversity of all kinds, and we believe they will be drawn even closer to the senator as he continues to fight for a shared vision to transform our country so it works for all of us not just the wealthy and well-connected, Sanders campaign manager Faiz Shakir said in a statement on Monday.