Albert Einstein once said:
“Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.”
With quotations, can you put a period after the quotation marks?
Take the period out after the quotation marks, and you're good to go. (Leave the one before the final quotation mark.) Also, you need a comma after "said" and no space after the first quotation mark.
Albert Einstein once said, “Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.”