Mike Brown says England's exit at the Rugby World Cup pool stage will continue to motivate him every time he plays for his country.
Brown played in three of England's four games as they became the first host nation to fail to reach the knock-out stages.
Eddie Jones' appointment as head coach appears to have inspired something of a turnaround, with England emerging victorious in their opening two games of the Six Nations against Scotland and Italy respectively.
Brown has featured in each of those wins and, ahead of the meeting with defending champions Ireland at Twickenham on Saturday, the full-back told BBC Radio 5 Live: "That disappointment [of the World Cup] will always be in the back of your mind as a player, something as big as that.
"The World Cup has been and gone, but, for me, I will always have it there at the back of my mind to motivate me even more, every single day, every time I am training, every time I'm playing, every time I'm lucky enough to pull on a white jersey."
Jones expects Ireland will prove tougher opposition than Scotland and Italy and Brown knows England must raise their game in order to stay unbeaten.
"We definitely know we have to keep stepping it up," Brown added. "Training has been good, confidence is building, so we are in a good place."