Being concerned about other people is especially relevant in today's world. If we consider the complex inter-connected ness of our modern lives, how we depend on others and others depend on us, our outlook will change. We’ll begin to see 'others' not as somehow distant from us, but as people we are in touch with, people close to us; we will no longer feel indifferent to them.
And he who has considered all the contrasts on this earth, and is no more disturbed by anything whatever in the world, the Peaceful One, freed from rage, from sorrow, and from longing, he has passed beyond birth and decay.
Do not pursue the past. Do not lose yourself in the future. The past no longer is. The future has not yet come. Looking deeply at life as it is. In the very here and now, the practitioner dwells in stability and freedom. We must be diligent today. To wait until tomorrow is too late. Death comes unexpectedly. How can we bargain with it? The sage calls a person who knows how to dwell in mindfulness night and day, 'one who knows the better way to live alone.'
Whether you believe in God or not does not matter much, whether you believe in Buddha or not does not matter so much; as a Buddhist, whether you believe in reincarnation or not does not matter so much. You must lead a good life.