"Mi Sh'Dochek es HaSh'ah..."
Today after I posted this, I kept hearing these words in my mind. I knew that I had heard them while listening to Rabbi Nassan Maimon's Likutey Moharan shiurim on my MP3 player, but I didn't remember exactly where in Likutey Moharan they were found.
Tonight I looked them up and found them in Likutey Moharan #20:5. Appararently these words come from the Gemara in Berachos 64a, "Whoever forces the moment, the moment forces him. But whoever yields before the moment, the moment yields before him."
To this, Rebbe Nachman of Breslov commented,
"Because of this, a person should not pressure himself about anything. Rather, he should request with pleading. If G-d will give it to him, He will give it; and if not, not."