Dilgo Khyentse Rinpoche - The Heart Treasure of the Enlightened Ones

 "The world and beings change direction every moment like stalks of wheat swaying to and fro in the wind, and what was true this morning is untrue by this evening.

Untimely rain, snow, hail, heat, and cold upset the natural course of the seasons.

Seeing all this, we must understand that there is no point in being excessively glad when something good happens to us, as it may well turn into its opposite at any time; and we must also understand that there is no point in being too depressed by bad circumstances, as our difficulties are minute compared to those endured by countless beings in the lower realms."