Emily

THE SKIES can’t keep their secret!
They tell it to the hills—
The hills just tell the orchards—
And they the daffodils!
A bird, by chance, that goes that way	5
Soft overheard the whole.
If I should bribe the little bird,
Who knows but she would tell?
I think I won’t, however,
It’s finer not to know;	10
If summer were an axiom,
What sorcery had snow?
So keep your secret, Father!
I would not, if I could,
Know what the sapphire fellows do,	15
In your new-fashioned world!

http://www.bartleby.com/113/2016.html
What Emily is trying to say here, or in my opinion, is simply keep your secrets to yourself becasue no one else will. Basically her trust is only in herself and shes urging us to do the same. Also, if we were to tell all our secrets where is the mystery or beauty of the unknown in life? The truth cannot always be found.