Treat samaya and vows as teachers; vows arises from karma:
If anyone knows about how painfully bad karma can be, then they will guard their vows with vigilantly and with less painlessly to maintain vows.
To know that every actions we do incur karma and we will start to know what to do and not to do for knowing the consequences of incurring negative karma.
Even Nagajurna cannot escape the death of beheading, but He transcend above world emotions by understanding how karma works.
Knowing that there are things that are subjected to impermanence, the suffering of clinging to unhappiness of change and not getting what we want, finally understanding to the true nature of No-self which leads to liberation of suffering.
Buddhism has powerful antidote to overcome negativity of mind such as greed, anger and ignorance.
There is a case of someone in the prison for so long and came out to seek vengeance and committed murder as soon as He is being released. The anguish was so strong that He could control himself but to seek vengeance. later He regretted and donated his organs to those in need and did not plead for mercy from death sentence.
If we could understand how karma works and the nature of mind, it will help us better to navigate away from negativity.
Hopefully, everyone understand that vows arises from karma and to prevent negative karma is to guard our vows and to monitor our mind. We should be lead by the working of karma by nose, if our troubled delusional mind arise. We must pinpoint it by saying to ourselves, my delusional mind has arises and monitor it such that it will soon disappear rather than to follow it and get more delusional by greed, anger and ignorance.