Gratitude, like faith, is a muscle. The more you use it, the stronger it grows, and the more power you have to use it on your behalf. If you do not practice gratefulness, its benefaction will go unnoticed, and your capacity to draw on its gifts will be diminished. To be grateful is to find blessings in everything, This is the most powerful attitude to adopt, for there are blessings in everything.
There is no quality I would rather have, and be thought to have, than gratitude. For it is not only the greatest virtue, but is the mother of all the rest.
The world breaks everyone or nearly everyone, of their childish illusions, assumptions and wishes, often painfully and afterwards due to the personal growth in practical experience, insight and the resulting wisdom many are strong at the broken places just like mended broken bones often are, and some people even have the great insight to be grateful for the purifying fire.
Keep your face always toward the sunshine everything could be worse but isn't and so we are justified in being grateful - and shadows everything could be better but isn't and so it is easy to be bitter 'unless you decide to look on the bright side will fall behind you.
Peace comes from within. Do not seek it without. It can be argued that peace and happiness comes from the subjective internalised perspective of realizing things could be worse and being grateful they aren't. The alternative view that peace and happiness comes from the objective external perspective of having more and better things than at present, while important for growth, can be a never-ending source of jealousy, dissatisfaction and disappointment. A balance of the two, where people are grateful for what they have while striving for more seems the best blended perspective.
Who was this Man of sorrows, acquainted with grief? Who is the King of glory, this Lord of hosts? He is our Master. He is our Savior. He is the Son of God. He is the Author of our Salvation. He beckons, “Follow me.” He instructs, “Go, and do thou likewise.” He pleads, “Keep my commandments.” Let us follow Him. Let us emulate His example. Let us obey His word. By so doing, we give to Him the divine gift of gratitude.
In the light of his vision that is the perspective that allows him to be grateful that things are not worse he has found his freedom and joy: his thoughts are peace, his words are peace and his work is peace.