The person who discovered the law of love was a far greater scientist than any of our modern scientists. Only our explorations have not gone far enough and so it is not possible for everyone to see all its workings.
Joy seems to me a step beyond happiness- happiness is a sort of atmosphere you can live in sometimes when you're lucky. Joy is a light that fills you with hope and faith and love.
Highest good is like water. Because water excels in benefiting the myriad creatures without contending with them and settles where none would like to be, it comes closest to the way.
The key to genuine happiness is in our hands. To think this way is to discover the essential values of kindness, brotherly love and altruism. The more clearly we see the benefits of these values, the more we will seek to reject anything that opposes them; in this way we will be able to bring about inner transformation.