We are not capable of feeling less than ten Sefirot in spirituality because ten is the threshold of our sensation. After the first nine attributes, we begin to feel ourselves existing, receiving, understanding, and feeling. And not before that.
It is like a ray of light that has not yet reached the brain through all the channels so that the brain would begin to react and draw for us a picture of what is happening.
Perhaps a signal has already entered the brain, but it has not reached me yet and I do not understand, do not feel, and do not react. Or if I do not hear well and have not heard the sound and the sound is already being made, it is making its way into my ears. This is called the first nine Sefirot.
From the 2nd part of the Daily Kabbalah Lesson 3/27/18, Talmud Eser Sefirot, Part 2