Two things are infinite: the universe and human stupidity; and I'm not sure about the universe.
Albert Einstein

Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.
Albert Einstein

Educate and inform the whole mass of the people... They are the only sure reliance for the preservation of our liberty.
Thomas Jefferson

It took a lot of blood, sweat and tears to get to where we are today, but we have just begun. Today we begin in earnest the work of making sure that the world we leave our children is just a little bit better than the one we inhabit today.
Barack Obama

We have an obligation and a responsibility to be investing in our students and our schools. We must make sure that people who have the grades, the desire and the will, but not the money, can still get the best education possible.
Barack Obama

We need earmark reform, and when I'm President, I will go line by line to make sure that we are not spending money unwisely.
Barack Obama

Let us be sure that those who come after will say of us in our time, that in our time we did everything that could be done. We finished the race; we kept them free; we kept the faith.
Ronald Reagan

One way to make sure crime doesn't pay would be to let the government run it.
Ronald Reagan

Sure I am of this, that you have only to endure to conquer.
Winston Churchill

It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so.
Mark Twain

When your friends begin to flatter you on how young you look, it's a sure sign you're getting old.
Mark Twain

All you need is ignorance and confidence and the success is sure.
Mark Twain

Be sure you put your feet in the right place, then stand firm.
Abraham Lincoln

One can never know for sure what a deserted area looks like.
George Carlin

When Thomas Edison worked late into the night on the electric light, he had to do it by gas lamp or candle. I'm sure it made the work seem that much more urgent.
George Carlin

When you focus on being a blessing, God makes sure that you are always blessed in abundance.
Joel Osteen

Before success comes in any man's life, he's sure to meet with much temporary defeat and, perhaps some failures. When defeat overtakes a man, the easiest and the most logical thing to do is to quit. That's exactly what the majority of men do.
Napoleon Hill

Every person who wins in any undertaking must be willing to cut all sources of retreat. Only by doing so can one be sure of maintaining that state of mind known as a burning desire to win - essential to success.
Napoleon Hill

It is unwise to be too sure of one's own wisdom. It is healthy to be reminded that the strongest might weaken and the wisest might err.
Mohandas Gandhi

He that waits upon fortune, is never sure of a dinner.
Benjamin Franklin