It is very important to generate a good attitude, a good heart, as much as possible. From this, happiness in both the short term and the long term for both yourself and others will come.
We must recognise that the suffering of one person or one nation is the suffering of humanity. That the happiness of one person or nation is the happiness of humanity.
This is my simple religion. There is no need for temples, no need for complicated philosophy. Our own brain, our own heart is our temple, the philosophy is kindness.