Knowing what's correct and not doing it, it's the worst cowardice.
Table your mistakes, learn from them, then move on.
Never tire to study. And to teach to others
If a man be under the influence of anger his conduct will not be correct.
To know, is to know that you know nothing. That is the meaning of true knowledge. When you say something, say what you know. When you don't know something, say you don't know. That is knowledge.
If one learns from others, but does not think, one will be bewildered. If, on the other hand, one thinks but does not learn from others, one will be in peril.