Adam Clarke on Jeremiah 9:1

O that my head were waters - מי יתן ראשי מים mi yitten roshi mayim, "who will give to my head waters?" My mourning for the sins and desolations of my people has already exhausted the source of tears: I wish to have a fountain opened there, that I may weep day and night for the slain of my people. This has been the sorrowful language of many a pastor who has preached long to a hardened, rebellious people, to little or no effect. This verse belongs to the preceding chapter.