Joseph's "Just My Thoughts"

Kenichi Omae (大前硏一) is a Japanese economist. He confidently asserted that there are only three ways to change our lives: 1. Spending time differently 2. Changing where we live 3. Making new people. Making new decisions is the most meaningless. Doing all three simultaneously is “marriage and divorce” and “changing occupation.” - Joseph’s “just my thoughts”

"Apples are the fruit" is a true proposition. At this time, "apples" are a Sufficient Condition to be fruit, and vice versa, because the "fruit to be an apple is more necessary for other conditions such as "red, round", the fruit is a Necessary Condition to become an apple. If the proposition of "If you respect someone, you'll get married" is "true," it's a "Sufficient Condition" to find someone you admire for marriage, but it's just only a "Necessary Condition" to find someone to marry for respect. Even with respect, you can not get married. You can't get married even if the Reverse Proposition is "true." Because marriage is a matter of "choice" before conditions or needs. If you want a respectable man, you can find a great man. To live comfortably, you can find a rich man. So, is there no Necessary-Sufficient Proposition for a marriage (conditions where both the proposition