Teach me, O Lord, when to speak -
not only how and what to speak;
Teach me, O Lord, to speak only 
when you want me to speak,
only after you have spoken and 
I have listened.

When Samuel went to sleep in his place, the Lord came and revealed his presence, calling out as before, “Samuel, Samuel!” Samuel answered, “Speak, for your servant is listening.” Samuel grew up, and the Lord was with him, not permitting any word of his to be without effect.

1 Samuel 3:10, 19

So many times my words are
without effect because they are
empty of you, Jesus, the Word who
became flesh; many times my words
are without effect because they are
empty of truth and sincerity, no love 
nor mercy, without any kindness and
care or concern.
Sad to say, many times, my words
are filled with evil and malice and lies; 
like the demons you have driven out
in the gospel, never allow me to speak
when my words are not coming from you.
O Lord open my lips,
cleanse my heart of every evil 
and worthless thoughts
so that my mouth shall 
declare your praise.  Amen.