The Aibishter says to a person: “Tzaddik’l, come here for a moment. I’m asking you to speak to your children on Pesach night.” The person asks, “What does this mean, that I should talk to him?” And the answer is, “Look into the chassidishe sefarim and how they discuss the koach hadibbur, and you’ll understand what it means.”
The Yid looks and says, “Ah, I understand that speech means the type of speech that will penetrate the heart... this is the tachlis. The tachlis isn’t simply to find a nice mashal or a gematria to say over. But how can I accomplish this? I don’t have the key to my son’s heart! I know him... he’s unfortunately not willing to hear anything... how can I make my words have power and potency?”
For this Chazal tell us: הלב אל נכנסים הלב מו היוצאים דברים. But how is this accomplished?
And this person is answered from Above, “We didn’t wait until Pesach night to tell you about this—we tell you about this special night in advance, and that the Ribbono shel Olam is waiting for you to prepare your heart, a broken heart... to do teshuvah. To daven for a koach haddibur. You should meditate and reflect on what it is you want to say. Later, your words will enter the hearts of your listeners.”