If you are Wayne Rooney, confidence plays a key part in your game. The same goes for Barack Obama delivering a keynote speech or a comedian delivering punchy one-liners.
My confidence in the police was shaken this week in the light of a damning report, which highlighted failures in the integrity of police-recorded crime.
It would appear that, nationally, police were failing to record one in five of all crimes reported, leaving more than 800,000 unrecorded each year. One third of these are are violent crimes and 26 per cent are sexual offences.
So back we go to the question of confidence.
It takes a long while to build up a level of trust between the public and a body such as the police and this week’s report blasted a huge hole through that bond.
Forces across the UK must act swiftly to try to explain the figures and put our minds at rest.