All grist that comes to my mill All is appropriated that comes to me; all is made use of that comes in my way Grist is all that quantity of corn which is to be ground or crushed at one time The phrase means, all that is brought - good, bad, and indifferent corn, with all refuse and waste - is put into the mill and ground together (See Emolument ) To bring grist to the mill To supply customers or furnish supplies
If you say that something is grist to the mill, you mean that it is useful for a particular purpose or helps support someone's point of view. (all) grist to the mill (all) grist for the mill something that is useful in a particular situation