Reus was instrumental in getting his club back into the game, with Dortmund going a goal down early on. Reus put his team back in front, before Robert Lewandowski scored a hat-trick to set Jurgen Klopp's side on the way to victory.
"It wasn't as easy as the final score suggests. Stuttgart actually did really well, especially at the beginning of the match," Reus told the official Bundesliga website.
"Perhaps we needed to concede a goal to wake us up a little bit. We were lacking in concentration in the first twenty minutes, but found our way into the game and created the goals really well. We really turned on the style in the second half. Against any team in the Bundesliga, it's always going to be difficult to win.
"If you lose focus and concentration as we did in the first few minutes against Stuttgart, you concede a goal straight away. If we're not having a good day, it becomes difficult. But we're playing at such a high level at the moment that we should always be able to get the right result. But that sort of thing mustn't happen very often."
Dortmund are currently top of the Bundesliga table, with Bayern Munich trailing one point behind in second.