The Four Noble Realities summarise the Buddhist teachings. They are usually called
the Four Noble Truths. But calling them 'Realities' not 'Truths' is better English. (For example, "1+2=3" is a TRUTH; but "1," "2," and "3" are REALITIES).
The Four Realities are considered Noble because, if practised correctly, they lead to
Enlightenment. They are:
1) Suffering
2) Cause of Suffering
3) End of Suffering
4) Path leading to the End of Suffering.
The Four Realities should be regarded in the following way:
1) Suffering "must be
understood."
2) The cause of Suffering "must be abandoned."
3) The end of Suffering "must be realised."
4) The Eightfold Path "must be practised."
The cause of Suffering is Craving and Attachment.
The Eightfold Path begins with the practice of virtue.
Practise the Four Noble Realities for the sake of
enlightenment.
Don't just talk about the Four Noble Realities: practise them!
The reason people suffer? They don't practise the Four Noble Realities.
Why do we suffer? Because of craving and
attachment. Because we are unvirtuous. Because we don't practise the Eightfold Path.