The truth about internal kung fu like tai chi is it's a long joutney but a good teacher will shorten your path.
Kung fu in Chinese language, kung refers to achievement, hard work, and Fu means skill cultivated through hard work.
The quiteness of body and mind in Tai Chi, When studying Tai Chi, the experience that proper control makes possible the condition of complete inner quietude by gradually reducing the power of external factors to disturb the inner life. When we speak of quietude in these types of metaphysical terms, it can be difficult to integrate into practice, to understand, the taijiquan you need your xīn (心) or heart to be ānjìng(安静) or quiet. In practice, each “discontinuity and continuity of form” – when the mind disconnects, or when the body “jerks” or “stops & starts” – is a moment when the heart is disquieted.
To remedy this problem, and reach a new consciouness toward the practical values of Zen (in one’s taijiquan practice), it is necessary to quiet the inner dialogue until it is “smooth as the surface of a pond on a windless day.” Something to this effect was a saying
"As the surface of the sea is troubled by the winds, so the thoughts & emotions of men are troubled by the storms of circumstance. But the deeper parts of the sea are not troubled by the tempest, and in each of us is a region of peace where self abides forever in blessedness. "-Manly Palmer Hall“The Spirit of Zen”.
Masters who reach this level of attainment have a form that looks very smooth, without jerkiness or changes in pace.