The Creator wants the created beings to understand and to attain Him correctly. He chose the language of “pleasure” or “sufferings” to which we respond. The Creator created the desire to receive so that will feel this language.
The Creator “pricks” the created being, and he cries, “Ouch!” He spills a drop of sweet syrup on him and the created being is impressed, “Ah!” And so our whole life goes by between the “ouch” and the “ah.” He speaks to us by using this language: A drop of sweetness, a drop of bitterness, and different combinations of the two lead to endless nuances and various shades.
Thus the Creator develops the desire from a primitive desire to a more sophisticated, versatile desire by feeding it gradually: a spoonful of sweetness and a spoonful that is a bit more bitter, so one tastes all the different flavors.
This variety (TANTA) is born in my desire to receive, according to the way I begin to respond and to feel the Creator’s bestowal. He constantly influences me, either by pleasures or by deficiencies, by bitterness or by sweetness.
I don’t know why the Creator has chosen this bittersweet language to communicate with His created being. I only know that if I perceive all this bitterness and sweetness, if I feel them in all my desire to receive, then by that I will learn to understand the Creator. I will be able to understand not the actual bitterness and sweetness and how they are felt in my desire, but I will discover Him, the one who has chosen this language in order to communicate with me.
From the 3rd part of the Daily Kabbalah Lesson 3/08/13, The Study of the Ten Sefirot