Answer: You shouldn’t judge it by a sweet or bitter taste, but by the scale of “true versus false.” Only then can a person understand whether or not he advances.
You might suggest: “Then let’s make bitterness a criterion. The more bitter it is, the closer I am to spirituality.”
But where is this written? Why does it have to be precisely this way? On the contrary, it’s only in order to make an analysis that you should ascend above the bitter and sweet taste to truth and falsehood in order to discern them and merge with the truth. However, when merging with it, you have to attain the state where truth and sweetness will be one. You have to raise sweetness to truth so that “the darkness will shine as Light,” so the bitter will become sweet.
Then everything will unite in the truth. It is written that truth will be cast onto the ground and will grow through from the ground. In other words, the truth will grow through inside of you and it will already contain all the other details of perception: bitterness, sweetness, and falsehood.
From the 1st part of the Daily Kabbalah Lesson 2/6/11, Writings of Rabash