There is something about the pure herbal goodness that is so soothing.
Particularly, when you are going through a stressful or a generally less-than-ideal time, brewing and pouring yourself a mug (or glass cup, like in the above image) feels like a most natural method of finding your calm center.
Or if not your calm center, if the turmoils of life have been so grand or so unavoidable to your thoughts that it seems nearly impossible to find any sense of peace in the midst of them, tea can at least act as your 5-10 minute (or even 15) breather. As you wrap your hands around the cup and take in the light steam subtly infused with the sweet or tangy scent colored by the flavor you have chosen, you begin to forget for a minute what was taking place around you just moments ago, and you concentrate on the allure and the comfort of the beverage you hold like it were to take you to safety in the middle of the whirlwind storm.
Or, if you're not in need of being rescued from the negatives you are going through, tea can help you emphasize the positives (which I hope win over your number of negatives disproportionately).
For example, are you sitting by the window and watching the Sun come out, after what felt like an eternity of rain buckets? Make yourself your favorite mug of tea, whether it be earl grey (which I personally love to blend with 2% milk and honey), green, or oolong tea (my latest obsession; apparently its caffeine level is somewhere between black tea and green tea); then, sit by the window as you take in the lovely scenery, aaccompanied by the spontaneous, calming bird chirping that fits in the nature just as effortlessly as tea does in your day.
Enjoy a cup of tea today!