“All negativity is caused by an accumulation of psychological time and denial of the present. Unease, anxiety, tension, stress, worry – all forms of fear – are caused by too much future, and
not enough presence. Guilt, regret, resentment, grievances, sadness, bitterness, and all forms
of nonforgiveness are caused by too much past, and not enough presence.”
― Eckhart Tolle, The Power of Now: A Guide to Spiritual Enlightenmen
I must say that this is very true. Profound.