When you write down your ideas you automatically focus your full attention on them. Few if any of us can write one thought and think another at the same time. Thus a pencil and paper make excellent concentration tools.

Waste your money and you're only out of money, but waste your time and you've lost a part of your life.

If you really want to focus on something, says Castellanos, the optimum amount of time to spend on it is ninety minutes. "Then change tasks. And watch out for interruptions once you're really concentrating, because it will take you twenty minutes to recover.

Ideas? My head is full of them, one after the other, but they serve no purpose there. They must be put down on paper, one after the other.

Always write your ideas down however silly or trivial they might seem. Keep a notebook with you at all times.

Waste your money and you're only out of money, but waste your time and you've lost a part of your life.