Wonder is the beginning of all wisdom.
To know thyself is the beginning of wisdom.
Let the questions be the curriculum.
All that I know is nothing - I'm not even sure of that.
Are not all things which have opposites generated out of their opposites?
To use words and phrases in an easygoing manner without scrutinizing them too curiously is not in general a mark of ill-breeding. On the contrary, there is something low-bred in being too precise. But sometimes there is no help for it