Strength comes from within and one should always realize its value and use it to the best benefits. Let us see how mentally strong people would handle situations without making any excuse.
Usually, a mentally strong person would never lay the blame squarely on someone else or some other reason. Normally it is only a reluctant listener who would respond by saying that he deserves to be happy and so is behaving in a particular manner. Happiness is a state of mind, and one does not have to strive or draw attention towards it.