Then again, without optimism, we might still be stuck in the Stone Age.
Optimism without thoughtful and determined action can lead to disaster.
Peace talks began in Kenya on November 1st, but without several key warlords or much optimism.
If Mr Obama resembles anyone in recent British history, it is Tony Blair, another leader from everywhere and nowhere, who synthesised charisma, optimism and gushy rhetoric without causing too much alarm.
Or to put it another way, we should all probably keep our fingers crossed that investors' optimism is well-founded, without betting our livelihoods on it.
It said that business optimism could be "short-lived" without the investment.
As a new group of citizens takes an oath to support and defend our country's oldest principles, we affirm another truth: that our American journey and our success would never have been possible without the hope, the drive, and the irrepressible optimism that every generation of immigrants has brought to our shores.
Without leaving his scientific footing, Simon developed a bias for optimism about man, knowledge, science, technological progress and the future.
On the other hand, Maliki would not have won a second term without backing from Shiite firebrand Moktada al-Sadr, so optimism is not indicated.
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The latest bounce in prices of risky mortgage debt comes amid strong rallies in stocks and corporate bonds, underpinned by investors' optimism that European governments and banks will work through their debt woes without destabilizing global financial markets.
"The optimism created by these countries' suddenly finding that they could have low interest rates without their currencies collapsing, which had been their previous experience, led people to think that there was a genuine rate-of-return revolution going on, " he says.
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Without those assumptions it might not be feasible to begin a program in the first place, but the optimism is then compounded by a budgeting process that cuts available funds to reconcile all the claimants participating in the process.
Other banks and securities firms quietly expressed optimism that the SEC's continuing probe of Wall Street's mortgage machine will be resolved without major fines or humiliating revelations about deals done during the mortgage bubble.
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