I think what this quote is trying to put forward is; when there is an unpleasant situation e.g. war, instead of making it worse say if you decided to support one side more than the other or supply them goods or weapons etc you will make the opponents more angry and come back stronger so it will just worsen the situation. So you should do the wise thing and rather than that just wait until the right time and stay out of it and there surely will be an end to it, it can't go on till the end of time.
That's the best I can get out of it
Hope it helps