From Living With Others (#R4) by Rabbi Avigdor Miller
Life is full of opportunities. That’s what Shlomo Hamelech is telling us in Koheles: “lakol zman” there is a time for every kind of perfection. One opportunity gives you things that the other opportunity won't give you. If you’ll make use of all of them, then you become the perfect man. That's why we’re in this world.
There is a time for every kind of perfection
Here’s a man married to a woman, she is a nuisance. If he had a different wife, he tells himself, things would have been different. His partner is a nuisance; he tells himself if he had a different partner things would have been different. His father is a nuisance, if it was a different father, things would have been different. And so he goes through life with excuses and alibis; “If things had been different…”
Shlomo Hamelech comes along and says, this is the father for you, make use of him. He’s bothersome and if you succeed with him, that's your success. Be the best son you can to that father. To that wife, be the best husband you can, or to this husband be the best wife you can. To this mother-in-law, be the best daughter-in-law that you can. To these brothers and sisters, be the best brother you could be. That's why you have brothers and sisters; you are being tested. These are opportunities.
The man who understands this tries to be the best brother to his brothers and sisters and the best son to his father and mother. You don’t have them forever. The time comes and they're gone and the opportunity is gone forever; never again can you be a good son. And you will have lost one of the reasons for living.