Psalms 42:3 - Exposition

My tears have been my meat day and night, while they continually say unto me, Where is thy God? (comp. Psalms 80:9 , "Thou feedest them with the bread of tears ;" and Ovid, 'Metaph.,' 10:288, "Cure dolorque animi, lachrymaeque, alimenta fuere"—"They who grieve deeply do not eat; they only weep;" yet they live on, so that their tears appear to be their aliment). David's grief at being shut out from God's presence is intensified by the reproaches of his enemies, "Where is thy God?" i.e. "Is he not wholly gone from thee? Has he not utterly cast thee off?".