“Bhikkhus, whatever clansmen in the past rightly went forth from the household life into homelessness, all did so in order to make the breakthrough to the Four Noble Truths as they really are. Whatever clansmen in the future will rightly go forth from the household life into homelessness, all will do so in order to make the breakthrough to the Four Noble Truths as they really are. Whatever clansmen at present have rightly gone forth from the household life into homelessness, all have done so in order to make the breakthrough to the Four Noble Truths as they really are.
“What four? The noble truth of suffering, the noble truth of the origin of suffering, the noble truth of the cessation of suffering, the noble truth of the way leading to the cessation of suffering. Whatever clansmen rightly went forth … will rightly go forth … have rightly gone forth from household life into homelessness, all have done so in order to make the breakthrough to these Four Noble Truths as they really are.
“Therefore, bhikkhus, an exertion should be made to understand: ‘This is suffering.’… An exertion should be made to understand: ‘This is the way leading to the cessation of suffering.’”