It's spring and Jurgen Klopp's Liverpool are still on course for a historic quadruple this season.The Reds have already claimed the Carabao Cup but are also in the quarter-finals of the Champions League, the semi-finals of the FA Cup and sit one point behind Manchester City in the Premier League.Whatever happens between now and the end of May, it's been quite a season for the club.In fact, it's been quite an era and none of this would have been possible without Klopp leading the way.It's easy to forget just how unsuccessful the club were before the German took over.Klopp was appointed manager in October 2015 - a season in which the club finished 8th. Other than their 2nd place finish during the 2013/14 campaign, Liverpool hadn't finished above 6th in their previous six seasons.They were very much a Europa League side at best.In fact, Klopp very nearly led Liverpool to victory in that competition during his first season in charge.Having taken over from Brendan Rodgers, Klopp's Liverpool completed an incredible second half comeback against Borussia Dortmund in the quarter-finals of the Europa League.That set up a semi-final clash with Villarreal.They lost 1-0 in the first leg in Spain, Liverpool beat the Yellow Submarine 3-0 at Anfield in one of those special European nights.And Klopp himself really helped with the atmosphere that night.A legendary clip has resurfaced of the Liverpool boss celebrating a James Milner tackle as if it was a goal. Klopp fist pumps Milner's challenge before turning to the crowd, waving his hands to make them even louder.

VIDEO: Jurgen Klopp's reaction to James Milner's tackle

Now that's passion.

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It wasn't to be for Liverpool in that competition as they were beaten by Sevilla in the final.

But that was just the start.

Six years on and Liverpool are on course to make history.

And Klopp's passion hasn't changed in those six years - neither has Milner's commitment.

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