"Will the real Eamon Ryan please stand up? Is it the aforementioned answer or the one about which the minister is now fantasising? The minister is desperate… I despair of the minister" - during a debate on energy policy when Mr Ryan was Communications Minister and Mr Varadkar a Fine Gael TD, October 12, 2010.
"We have any number of economic strategies. I encourage Deputy Eamon Ryan to read them" - after the Green Party leader asked for the Government's economic strategy, October 18, 2017.
"Sometimes when I hear the deputy preaching from his perch on the edge of the chamber, I almost forget the fact that he was not just elected to the Dáil in 2016. He was, of course, Minister for Communications, Energy and Natural Resources for four and a half years. He had responsibility for this area for four and a half years when he served in office with Fianna Fáil during that disastrous government which led the country to bankruptcy, never mind individual enterprises" - responding to questions from Mr Ryan on the Facebook/Cambridge Analytica controversy and media funding, April 17, 2018.
"Obviously, in his mind it is OK to cast aspersions, but it is totally indefensible or unacceptable for me to dare to respond or cast them back. That is the double standards one so often gets from the Green Party. It does not just disagree with you; it is also better than you. That is fundamental to its attitude to others and politics" - during the same Dáil debate, April 17, 2018.
"The deputy is a very excitable gentleman, is he not?" - on the Green Party leader's criticism of the number of roads projects in Project Ireland 2040, September 26, 2018.
"He believes markets know best and that government should have a minimal role in shaping our future. He is inspired by the American dream of individual attainment. He represents those who get up early in the morning and [he] openly questions the motives of those on social welfare.
"He is bringing us back to the old way where short-term economic interests define what we say and do. He is young and quick and good with words - but I for one don't buy this vision of our future" - in a speech to the Green Party national convention, March 24, 2018.
"I think Leo... he's very far to the right, that's his instinct, that's where he comes from… I also think he hasn't got a green bone in his body... when he doesn't know the answer he goes on the personal attack" - during an interview on Independent.ie's The Floating Voter podcast, July 5, 2018.
"The Government's development plan sucks when it comes to climate action and it will not do the job" - speaking to the Taoiseach during a Dáil debate on the national development plan, September 26, 2018.
"We can't get Fine Gael out quickly enough" - responding to an Environmental Protection Agency report showing Ireland had missed its EU emissions reduction targets, October 29, 2019.
"Fine Gael is still caught in a 1980s, yellow-braces, Gordon Gekko, greed is good, market-knows-best view of the world and it's not working in housing" - speaking about the Taoiseach and Housing Minister Eoghan Murphy's response to the housing crisis in an interview with the 'Irish Daily Mirror', September 15, 2019.