The 30-year-old has not played for his country since last season's clash with Wales and feared who would never add to his 56 caps.
But he has been rewarded by Ian McGeechan after recapturing his form and he is relishing his starting role against Ireland.
Logan beamed: "I just wanted to get back in there and get a good six nations and go to the World Cup and see how we got on there.
"I've always had that belief in myself and that confidence - but once you get the inner confidence people don't see that's when you know that you're flying. A lot of the guys, even at Wasps, have got that.
"And at Scotland we've got that belief we can do well and when you can see that at training it makes a difference to everyone else."
The country is on a high after their impressive autumn success and Logan is also thriving after coming through a slump in form.
He continued: "I've had my ups and downs.
"I watched in November and they were very impressive against South Africa and the forwards were absolutely immense.
"We've been doing our rucking drills with Jim Telfer this week and he's a great coach and gets the forwards going well and it's a great team with Geech and Jim.
"I was fit for the South Africa game but I just wasn't playing well.
"I was thinking too much about trying to get into the squad and Shaun Edwards said to me 'stop thinking about rugby and just get on with it'.
"I just got on with it, forgot everything else and started enjoying myself again. I think you go through these seven year troughs and I'm just starting to come out of mine now."
Glasgow wing Glenn Metcalfe has also suffered a crisis of confidence with his club going through a difficult time and the 32-year-old admits that he is lucky to even be in McGeechan's squad.
He said: "Confidence is a big thing and we've been trying hard and trying to get on the right side of the scoresheet every game.
"But the confidence hasn't come through and we've played like individuals and not really as a team.
"The effort is there and I've tried to think about my game and do the basic things right."
Metcalfe has enjoyed being part of the squad and feels it has given him a fresh start.
He added: "Playing for Scotland is almost like wiping the slate clean and I've tried to keep my confidence up and feed off the rest of the guys in the squad.
"There's Edinburgh and Borders players who are playing really well and you feed off them.
"You can't go into an international like this feeling a bit low. You've got to get yourself up - and I've always tried to bring my confidence onto the field."