Speak everything you know without reservation
Explanation: Just tell what you know, and speak without reservation.
From "Heng Lun·Yuan Xi" by Su Xun of the Song Dynasty: "Speak everything you know, and speak everything to the fullest. A hundred people will praise you without encrypting it, and a hundred people will destroy it without sparing it."
Example: He is very straightforward and always responds when others ask him for advice.
Grammar: complex sentence pattern; used as object and clause; contains complimentary meaning.
I hope it can help you!