What situations have you encountered that are limited by language and "can only understand, but can't express"?

The literal interpretation of this sentence is: you can only understand it in your heart, but you can't say it, or it is difficult to have a fixed vocabulary to express such intentions and opinions clearly. This kind of description is common in the psychological activities and body language of characters, but it is rarely used in a certain academic field. Basically, it can be said that in any academic field, it is impossible to have the so-called "meaning but not words". Such a statement that calligraphy is shrouded in mystery for no reason is either deliberately deceiving or pretending to be profound. It is entirely out of personal ulterior motives, not from art itself. Learning calligraphy, of course, requires wisdom, but it also requires long-term study and hard practice. Whether it is the extremely high-end clock, Zhang, Xuan in history or the modern hard pen closest to civilians, it is inseparable from the initial love and diligent study. The inheritance and continuation of every teacher is the ultimate pursuit of tireless teachers to preach and teach to solve doubts, transform people's hearts, enlighten human nature, create a foundation, and finally achieve academics. If a teacher can't tell the truth every time, it can only be said that the teacher is incompetent and unqualified, and there is no other solution.