You can choose to hold your ground or to let go; there is no absolute right or wrong.
Cars are always changing, but people are not. You first need to learn to understand others. No matter what customers say or do, remember to do your work well and treat them with proper courtesy.
Character comes from habits, and habits come from day-to-day actions.
The basic attitude in life is tolerance, and the best expression of life is a smile.
Because humans are never fully satisfied, life itself can never fully satisfy. The more you desire, the more hardships you may need to endure. Thus, it is not life that challenges you, but you who challenge yourself.
Lose anything but not your character; fail at something but not your temperament.
Will lost things return? Probably yes. I once lost a button, and when I eventually found it, I had already changed my coat.