A liquid petition?

from Spurgeon's sermon, "Jesus Wept"

No prayer will ever prevail with God more
surely than a liquid petition, which, being
distilled from the heart, trickles from the
eye, and waters the cheek. Then is God won
when he hears the voice of your weeping.
If you want to win in prayer, you must weep
in prayer. Let your soul arouse itself to
eager desire, and trouble itself to anguish,
and then you will prevail. "Jesus wept" to
teach us how to baptize our prayers unto
God in a wave of heart grief.