If one's life is too smooth, then he will develop a sense of superiority.
Moreover, this person's ability to face setbacks is practically zero. When he encounters a setback, he will undergo a tremendous change, and may even lament to the heavens in despair.
However, if a person continually faces setbacks and experiences no moments of ease, two outcomes can occur. One is that the person becomes exceedingly strong, at least psychologically, because constantly facing setbacks without encountering other situations would inevitably strengthen anyone psychologically.
If one's psyche is not strong, then every encounter with a setback could drive the person to collapse.
On the other hand, continually facing setbacks leads to resentment and blame, which is natural. Anyone continually encountering setbacks and never facing favorable situations would end up resentful.
