A heart of gratitude is open, receptive, living in growth and satisfaction.  This is why exercising gratitude is associated with positive outcomes in mental and physical health.  When you get stuck in comparison you are calculating, measuring, and categorizing life and people.  Comparison makes you more narrow and rigid, inhibiting growth and good positive relationships.

Be cheerful no matter what; pray all the time; thank God no matter what happens. This is the way God wants you who belong to Christ Jesus to live. 1 Thessalonians 5:18 MSG

Learn to cultivate the habit of being grateful for every good thing that comes to you, and to give thanks continuously. and because all things have contributed to your life, you should include all things in your gratitude.

“Let us be grateful to the people who make us happy; they are the charming gardeners who make our souls blossom.”
― Marcel Proust