What is the right thing to do?

That is along time when i wrote the last entry. Many things to write but i have no time to do that. Every day goes by, every memory i want to remember forever, all emotions: sadness, happiness... all aspect of life: work, friend, family... Sometime i feel sad, disappointed, i come back my blog and memorize my happiness, everything... I remember the statement of a monk: "who do wrong things, they will pay for them". i always ask me "what is the right thing to do?". Sometime i will do something people do not like, and i do not know it is right or wrong. In life, how can i determine that "what is the right thing to do?".