@nguyenhung
The biggest changes often come from things others don't see.
Sometimes, big changes don't need to be immediately apparent. Outwardly, things may be quiet, but inside, the mind and emotions are constantly in motion. Small changes in thinking, self-care decisions, or simply a maturation in one's perspective on life—all happen silently.
These are the most profound transformations, often changes not easily noticeable to outsiders. But it is these changes that make a big difference in each person's life. Each small step, when nurtured, leads to great achievements.
Don't worry if you don't see the changes immediately, because the inner process usually takes time to mature. Things that are unseen will eventually reveal themselves, but they will certainly always bring about positive results.