http://www.accesstoinsight.org/tipitaka ... .olen.html
Those who abide in the forest, Peaceful, living the holy life; Those who eat but a single meal; — why is it their face is so calm?
They do not grieve over the past, Nor do they yearn for the future; They live only in the present — That is why their face is so calm. It's from yearning for the future, And from grieving over the past; This is how fools become withered — Like a fresh reed that's been hacked down.
Excellent citation! Thank you!
Buddha, during his dissertation regarding his unbinding, release and awakening explained that he could see many of his past lives, which is essentially dwelling in the past. Buddha explained during his dissertations regarding Khamma and Khamma-vipakha that rebirths in unfortunate realms were to be feared as a consequence of harmful intentional actions, which is dwelling in the future, but he had no attachment to any of those revelations. His purpose in revealing them was to provide us with instructions so as to warn and teach that it is wise to reflect upon our actions: Learning from past consequences, and making reasonable predictions as to potential courses of actions so as to guide our choices based upon the most beneficial potential outcomes.
What Makes an Elder? :
A head of gray hairs doesn't mean one's an elder. Advanced in years, one's called an old fool.
But one in whom there is truth, restraint, rectitude, gentleness,self-control, he's called an elder, his impurities disgorged, enlightened.
-Dhammpada, 19, translated by Thanissaro Bhikkhu.