Chasidut zu Tehillim 10:78

I heard from my teacher, the Baal Shem Tov of blessed memory, the meaning of the verse (Psalms 10:17) "Prepare their heart, incline Your ear." This is a sign given to mankind, that if you can prepare your heart to pray before the Holy One, without any foreign thoughts at all, with all the love and awe you can muster, then you can be sure that the prayer has been accepted. This is the meaning then of "Prepare their heart, incline Your ear," for while you pray you can know that it is being received and heard by God's ears. And the words of the wise are wonderful!