I’ve seen - both in myself and my competitors - how satisfaction can lead to a lack of vigilance, then to mistakes and missed opportunities.

Boris Nemtsov and I began to argue after Putin's return to the presidency in 2012. In my opinion, there was no longer a realistic chance to achieve regime change through peaceful political means, or real elections. Boris, on the other hand, never lost this hope. He felt that my assessment was premature and said: "You have to live a long time to see changes in Russia." He was deprived of that opportunity.

Learning from our mistakes is critical for improving, but even I don't have patience for ranking my regrets. Regret is a negative emotion that inhibits the optimism required to take on new challenges. You risk living in an alternative universe, where if only you had done this or that differently, things would be better. That's a poor substitute for making your actual life better, or improving the lives of others. Regret briefly, analyze and understand, and then move on, improving the only life you have.

Intelligent machines will continue that mechanization process, taking over the more menial aspects of cognition and elevating our mental lives towards creativity, curiosity, beauty, and joy. These are what truly makes us human.

Rosneft, for instance, was mainly built upon capital stolen from [jailed oligarch Mikhail] Khodorkovsky's company, but the IPO was successful with many Western corporations investing in it. This means that it is extremely difficult to detect these assets in their pure form.

There is no one that can share your responsibility. It it is your responsibility you must carry it on and you must be responsible for your actions. At the end of the day we all are being challenged, sooner or later, by our destiny. And it's up to us to make all the difference in this life. If not you, who else?

A grandmaster must memorize thousands of chess duels in his head, as these are for him what words of the mother tongue are to the ordinary people and what notes are to a musician.