After the shock loss at St Johnstone two weeks ago, much was made of Celtic's reaction to such a rare defeat.
Brendan Rodgers ordered his side "to do something" against the Perth side in Sunday's Scottish Cup semi-final, according to Arne Engels.
Four goals in 12 fantastic first-half minutes ended the tie as a contest before the break, with Jota wrapping up the dominant win after the break as Celtic set up a final showdown with Aberdeen.
The "energy and motivation" throughout the Celtic team is key, said Belgium midfielder Engels, who is keen to show the high level they can maintain in the final weeks of the season.