The Four Noble Truths
The Four Noble Truths is the summary of the Buddha's teaching, and yet it profoundness never stops amazing me. It is simple to express, but challenging to plummet its depth.
The Four Noble Truths are there is misfortune, the cause of this misfortune is wanting, this misfortune can be ended, and the way to end it is through the Noble Eightfold Path of right view, right resolve, right action, right speech, right livelihood, right effort, right mindfulness, and right meditation.
It is laid out like a doctor treating a disease. First is the diagnosis, then the etiology (the cause), then the prognosis, and finally the treatment plan. Doctor Buddha has looked at the disease of the bad situation of this endless cycle of rebirth we are trapped in and he has discovered the cure.
In plain talk, life sucks. It sucks because of the wanting mind. Remove the wanting from the mind and you are released from the endless cycle of rebirths. Removing the wanting from the mind is not easy. It requires eight sets of practices that must be implemented daily. But freedom is possible.