Jealousy comes from counting others' blessings instead of our own. So very true, don't let your life pass by while you worry about someone else, count your blessings, be grateful, be happy for others (even though it can be hard).
Eckhart Tolle: “Wisdom comes with the ability to be still. Just look and just listen. Being still, looking, and listening activates the non-conceptual intelligence within you Let stillness direct your words and actions.