¥Not to let God know our needs; God already knows what we will pray
for.
–Matt 6:31 (NIV) So do not worry, saying, "What shall
we eat?" or "What
shall we drink?" or "What shall we wear?" 32 For the
pagans run after all these things, and your heavenly Father
knows that you need them.
¥Not to get God to change His mind; if it isn't His will, you won't get
it.
–Matt 26:39 (NIV) Going a little farther, he fell with his
face to the ground and
prayed, "My Father, if it is possible, may this cup be
taken from me. Yet not as I will, but as you
will."