Notwithstanding a brilliant beginning at Selhurst Park, they yielded two objectives either side of half-time as Palace won 4-0 on Sunday.
"There is just such a lot of you can continue to attempt to adulate somebody to give them certainty," director Lampard said.
"We are playing at the vicious finish of football here. This is a cup quarter-last to get to Wembley and on the off chance that you lack certainty to play, you can rapidly flip it and say do you have the bollocks to play?
"Apologies, excuse me, however that is the football reality. In the event that you fall some place in the center then don't stress over it."
First-half objectives from Marc Guehi and Jean-Philippe Mateta put Palace in full control, before Wilfried Zaha and Will Hughes got the success.
"We didn't play that severely today and Palace didn't play that well and we lost 4-0 on account of an absence of certainty and an absence of what I recently said," Lampard added.
"It wasn't strategies. Strategies displayed in the initial 20 minutes Palace couldn't escape their half."
Everton last arrived at the semi-finals of the FA Cup in 2015-16 and have not won a significant prize since their triumph in the last in 1995.
"Perhaps it isn't Everton's time, or my experience as Everton supervisor to be there. It is Palace's time. The occupation is to keep awake and that is its truth," Lampard said.
"To win today and go to Wembley or keep awake? We know the response. We performed at 70% and that isn't sufficient."
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