"I can't go back to yesterday - because I was a different person then"

"Tomorrow is the most important thing in life. Comes into us at midnight very clean. It's perfect when it arrives and it puts itself in our hands. It hopes we've learned something from yesterday"

"The politician's promises of yesterday are the taxes of today"

"Each day is the scholar of yesterday"

"An economist is an expert who will know tomorrow why the things he predicted yesterday didn't happen today"

"Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning"

"I am tomorrow, or some future day, what I establish today. I am today what I established yesterday or some previous day"

"I saw a report yesterday. There's so much oil, all over the world, they don't know where to dump it. And Saudi Arabia says, 'Oh, there's too much oil.' They - they came back yesterday. Did you see the report? They want to reduce oil production. Do you think they're our friends? They're not our friends"

"Tomorrow doesn't exist, yesterday is gone. The more I remind myself of that, the stronger I feel"

"I, not events, have the power to make me happy or unhappy today. I can choose which it shall be. Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, today, and I'm going to be happy in it"

"The outer passes away; the innermost is the same yesterday, today, and forever"