“Thus says the Lord God: ‘I will also let the house of Israel inquire of Me to do this for them: I will increase their men like a flock'” (Ezek. 36:37).
“…Yet you do not have because you do not ask. You ask and do not receive, because you ask amiss, that you may spend it on your pleasures” (James 4:2b,3).
F. B. Meyer wrote :
“Prayer is part of the system of cooperation between God and man which pervades nature and life. No crop waves over the autumn field, no loaf stands on our breakfast table, no metal performs its useful service, no jewel sparkles on the brow of beauty, no coal burns in hearth or furnace, which does not witness to this dual workmanship of God and man. So in the spiritual world there must be cooperation, though on the part of man it is often limited to prayers, which may seem faint and feeble, but which touch the secret springs of Deity; as the last pic of the miner may break open a fountain of oil or a cavern set with dazzling jewels.”
Charles A Cook admonished,
“Seeing so much depends on prayer let us never neglect this cooperation with God which God has ordained for us. Let us remember that if our part is left out the law [principle] will not operate and the blessing will not come.” (from Practical Prayer Portions for Daily Reading (Moody Press).