Friends:

 The Twin Truths won by Dual Consideration:
 

The blessed Buddha once said:
Friends, the first clever consideration is:
Such is Suffering, and This is the Cause of Suffering.
Another consequent and subsequent consideration is:
Such is the End of Suffering, and This is the Way to end Suffering.

One who lives considering these cautiously, resolutely and enthusiastically,
may either enter the state of Nibbāna  right here and now in this very life,
or if there is remaining traces of clinging, the state of non-return...
Those who neglect understanding Suffering, The Cause of Suffering,
The End of Suffering, and The Way all Suffering is completely eliminated,
are incapable of release by understanding, are incapable of mental release,
are incapable of direct knowledge, and are thereby incapable of making an end...
While those who undertake to develop real understanding of This Suffering,
The Cause of Suffering, The End of Suffering, and The Way to End Suffering,
are indeed capable of mental release by understanding, direct knowledge,
and thus also capable of making an end...

                    

Dig further here on the 4 Great and Noble Truths:
https://What-Buddha-Said.net/drops/II/The_1st_Noble_Truth_on_Suffering.htm
https://What-Buddha-Said.net/drops/II/The_2nd_Noble_Truth_on_The_Cause_of_Suffering.htm
https://What-Buddha-Said.net/drops/II/The_3rd_Noble_Truth_on_The_Ceasing_of_Suffering.htm
https://What-Buddha-Said.net/drops/II/The_4th_Noble_Truth_on_The_Way_to_Cease_Suffering.htm


Source: The Bundle of Threads. The Sutta-Nipāta 724-765
https://What-Buddha-Said.net/library/ati_website/html/tipitaka/kn/snp/index.html

Dual Consideration..