When it comes to preventing ...

When it comes to preventing Iran from obtaining a nuclear weapon, I will take no options off the table. ... That includes all elements of American power: a political effort aimed at isolating Iran, a diplomatic effort to sustain our coalition and ensure that the Iranian program is monitored, an economic effort that imposes crippling sanctions and, yes, a military effort to be prepared for any contingency.
When it comes to preventing Iran from obtaining a nuclear weapon, I will take no options off the table. ... That includes all elements of American power: a political effort aimed at isolating Iran, a diplomatic effort to sustain our coalition and ensure that the Iranian program is monitored, an economic effort that imposes crippling sanctions and, yes, a military effort to be prepared for any contingency.
 Barack Obama

Quotes from the same author

Here at home, we will strengthen our defenses but not succumb to a siege mentality that sacrifices the open society and liberties and values that we cherish as Americans, because great and proud nations don't hunker down and hide behind walls of suspicion and mistrust.
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 Barack Obama
Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.
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 Barack Obama
No party has a monopoly on wisdom. No democracy works without compromise.
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 Barack Obama
If you're walking down the right path and you're willing to keep walking, eventually you'll make progress.
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 Barack Obama
Focusing your life solely on making a buck shows a poverty of ambition. It asks too little of yourself. And it will leave you unfulfilled.
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 Barack Obama