Sitting in comfort, with table full of food. But your mind is the key, if you don't train it right, its like crazy monkey jumping everywhere, to the past, to the future, without you realize it and suddenly it brings anxiety about anything. Breath. Get your control and grab those monkey, train it to sit quietly. 

Look into now, then i see table full of food in front of me. 

Oh, there's delicious cake but you can't enjoy it because of your stupid thought wander everywhere? how stupid. You have comfort house, nice cloth, delicous cake, money, loving family, then you let yourself covered by gloomy feelin because of one thing you can not have? think twice, maybe you don't even know God don't let you get that thing is a blessing. Because God know whats best. 

Cheer up. Be grateful for what you have and what you don't. Both are blessing.

You just don't know it. But one day. you will understand the reason.