Challenges are something that can only be tackled in the present moment and require action.
Eckhart TolleDon't Seek Happiness. If you seek it, you won't find it, because seeking is the antithesis of happiness
Eckhart TolleAll 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