If Language is not correct, then what is said is not what is meant. If what is said is not what is meant, then what ought to be done, remains undone.
He who kisses girl on hillside is not level
If you know, say you know. If you don't know, say you don't know.
A workman who wants to do his work well must first prepare his tools.
Make faithfulness and truth thy masters: have no friends unlike thyself: be not ashamed to mend thy faults.
To know what is the right thing to do and not do it is the greatest cowardice.