Hearts head coach Steven Naismith to BBC Scotland: "The way we set up, the way we wanted to press, and then it was about having quality on the ball and using it in the right areas.
"We never allowed their transition moments, we got control of the ball and then had an attack most times.
"You'll take four goals, but it could have been six.
"It'll be a tough game [against Morton]. We know what we're going to, they showed it against Motherwell. Any game in the last eight is going to be tough.
"We're not doing much different to what we did at the start of the season. Now everybody understands what we're trying to do, and we work hard - that's the key.
"Hopefully [Craig Halkett] isn't too bad. He's felt something in his knee and we didn't want to take any risks.
"There's definitely a belief. We need to get through the next tie and then you're not far from the end goal."