"I can only go one way. I've not got a reverse gear."[1]
Simple: I can only go one way. I can not go backwards.
What it means: I can not go back and change my decisions.
"Mine is the first generation able to contemplate the possibility that we may live our entire lives without going to war or sending our children to war."[2]
Simple: This is the first generation to is able to understand that we can live all of our life and not to go to nor send our children to war.
"Ask me my three main priorities for government, and I tell you: education, education, education."[2]
Simple: The three main things I will focus on if I am prime minister will be education, education, education.
What it means: I will mainly focus on one thing – education.