Preach on this topic this weekend.
O Master, Lord our God, Who didst hear Elijah the Tishbite because of his zeal for Thee, and for a time didst command that rain be held back from being sent unto the earth, and again at his prayer didst grant it fruit-bearing rain: Do Thou Thyself, O Master of all, Who art being entreated, out of Thy deep compassion grant abundant rain unto Thine inheritance; and, overlooking our sins, do Thou send down Thy rains upon every place entreating and praying for it. Make glad the face of the earth, for the sake of Thy poor people and infants, and animals and all others, for they trust in Thee, that Thou wilt give drink unto them in due season. For Thou art our God, a God Who showeth mercy and saveth, and unto Thee do we send up glory: to the Father, and to the Son, and to the Holy Spirit, now and ever, and unto the ages of ages, Amen.
The work of Kallistos, Patriarch of Constantinople
From the Great Book of Needs, Vol. 4 pg. 50