This statement fits in everyone's life even if he is student , teacher, trader, a businessman or any other profession. People do compare with others which create dissatisfaction in their lives. There is famous saying in our local area that " eat little but eat will". Don't kill your peace of mind and let your 'wants' drive your mind. Be grateful for what you have and be the best in your own field. Everything takes time. Enjoy the life you are living now because time doesn't wait for anyone. Be physically fit and ensure your mental health as well. I have seen most of the people saying that the time gone was the precious one but the present is more beautiful unless you want it to. The future is unpredictable, you never know what's going to happen tomorrow. Chill and entertain yourself with your lovely ones until its too late.
I completely agree with you that we should not compare ourselves with others and should always be grateful for what you have. But at the same time, everyone should have goals in life. You can’t just sit back, relax, and enjoy the present all the time you also have to work towards your goals every single day. Your goals should never stop. Once you achieve one goal, set another and keep working until you achieve it. Life is all about continuous improvement. There is no complete peace in life.The only permanent peace comes with death. This isn’t called dissatisfaction its called becoming the best version of yourself.