It is not just a person's physical constitution, their intellegence, their education, or even their social conditioning that enables them to withstand hardship. Much more significant is their inner development. And while some may be able to survive through sheer willpower, the ones who suffer the least are those who have a high degree of patience and courage in the face of adversity.
If we see pride among people who have no idea about Dharma, it is understandable. However, if afflictive emotions and haughtiness are present among Dharma practitioners, it is great disgrace to practice
Love, compassion and concern for others are real sources of happiness. If you have these in abundance, you will not be disturbed even by the most uncomfortable circumstances. If you nurse hatred, however, you will not be happy even in the lap of luxury. Thus, if we really want happiness, we must widen the sphere of love. This is both religious thinking and basic common sense.