Speaker Paul Ryan touted the Republican majority’s accomplishments in the House during his farewell speech Wednesday at the Library of Congress and added a word of caution about the current rancorous state of political discourse.

“Three years ago, when we last gathered in this hall, we began a great journey to set our nation on a better path. To move our economy from stagnation to growth,” said the Wisconsin Republican, who will retire from Congress at the end of the year.

“This House is the most productive we have had in at least a generation,” he said. “To date, we have passed 1,175 bills, more than half of them with bipartisan support.”

Many of those bills never made it into law, but Ryan was most proud of his landmark achievement as legislator that did, the GOP’s tax reform bill, which is the Trump administration’s only major legislative victory to date.

The “first major overhaul of our tax code in 31 years” passed last December despite the “cynics saying it could not be done,” Ryan said, adding that tax reform was a longtime project of the congressman’s that he had worked on his entire adult life.

Ryan was first elected to represent Wisconsin’s 1st district in 1998 and reluctantly took over the speaker’s gavel in 2015. During his time in the House, Congress addressed, in Ryan’s words, “some of the biggest challenges of our time, and made a great and lasting difference in the trajectory of this country,” including a “historic rebuilding of our military and national defense.”

Ryan also echoed outgoing senator Orrin Hatch’s lament about the current acrid tenor of political discourse, but admitted he does not have the answer to solve it. “Too often, genuine disagreement quickly gives way to intense distrust,” he warned.” We spend far more time trying to convict one another than we do developing our own convictions.”

As far as goals for the future, Ryan called for comprehensive immigration reform, something he was unable to accomplish, saying it is an “economic and moral imperative” and “would go a long way toward taking some of the venom out of our discourse.”

“This place is full of wonders and opportunity. But do your best to stay grounded. The way I think of this is, either you change things or they change you,” Ryan said. “It is what I have prayed about every morning since I first came here. To keep my sense of self.”

The outgoing speaker also acknowledged his 2012 presidential running mate Mitt Romney, who will take over Orrin Hatch’s Senate seat in January. “I hear great things about this new fresh-faced guy from Utah,” he quipped.