1. Fighting waste precious energy better suited for other goals and gains.
2. Fighting normally pushing things away from you or causes you to lose sight of potential opportunities for you to advance.
Understand that when I say that fighting life is a waste of time I don't mean you should just roll over and play dead. But I do mean that you should not throw punches at every situation that comes your way that appears to have a view that isn't in line with what you want. You don't fight for a promotion by hurting others, you fight for a promotion by proving your value to others, helping them, learning, and improving yourself. You don't grow your business by fighting your competitors, you build relationships with your customers, make friends with your competitors and potentially share leads turning them into allies. And you don't make it in life by throwing punches at everyone and everything around you; Les Brown said it best, "If you help enough people get what they want, you will eventually get what you want." You don't become successful by fighting back and being seen as a hard-nosed, asshole. You become successful by being "kind" to others, helping them, not resisting the flow of things, but going with it and making slight trim changes along the way. If the meek will inherit the earth it could indeed be said that that will happen because all of the people fighting and resisting will have destroyed each other. Life is not a fight, life is a journey, we are all fish in a stream, and it is rarely in your best interest to go against the flow of that stream.
My other issue with fighting is that it causes you to lose sight of other potential opportunities. You spend so much of your time focused on your particular situation, that you don't notice the blessing or the opportunity behind it. When faced with a situation don't just turn and fight it, look around for a peaceful out, try to turn that negative situation into a positive one and remove the possibility of it coming back around to hurt you. Turn that enemy into a friend and you have a powerful ally. You can't teach a rude person a lesson by being ruder, you show them the way by killing them with kindness. Not the kindness that says I'm going to show you why I'm better than you, but the kindness that says I genuinely want to see you succeed and I will put myself out there to make it happen.
The strongest and most adaptable survive, and the meek will inherit the world because it takes an immense amount of strength to not fight someone or something trying to fight you. It takes even more strength to convert an enemy into an ally. But it takes even more strength to recognize a situation and move and adjust with it to your benefit, then to be rigid and unwavering. Its difficult to maintain morals and values and not lash out when someone tramples on them, but you get more done by helping that person then by hurting that person. If you kill a enemy you have one less enemy and the world has one less soul that could benefit it. If you convert a enemy you have a powerful ally, you no longer have to walk alone, and your ability to inspire the world doubles. Practice being meek, practice being non-resistant, practice being strong. The difficult part, being non-resistant without being a doormat.