All theory, dear friend, is gray, but the golden tree of life springs ever green.
The unnatural, that too is natural.
Even dirt glitters when the sun is shining upon it
At bottom, no real object is unpoetical, if the poet knows how to use it properly.
Nothing should be valued higher than the value of the day.
Do not give in too much to feelings. A overly sensitive heart is an unhappy possession on this shaky earth.