According to the Bible, humans are born into the world with a sinful nature (Psalms 51:5) and so naturally, humans are inclined to do evil rather than to do good. This obviously stems from the story of Adam and Eve in Genesis 3, but the key thing to note from there that is overlooked is that Satan uses a half-truth by telling Eve that she will be like God knowing good and evil (which is true) but not telling her that it will cause her to become evil (unlike God since he has the power to know evil without becoming evil).
In all of this, it doesn't mean that humans can never do good, but the Bible teaches from Hebrews 11:6 that you must have faith and works in order to do good in the eyes of God - which is what is pleasing to him. But we see that in Revelation 12:9-12 good has already overcome evil and that the world will never change. Rather the situation on earth becomes overcoming Satan because his purpose becomes encouraging people to join him on the losing side and ultimately die. Later in Revelation, it expresses the second death, meaning that humans are destined to die once, but there will be a second death for those who aren't true Christians (disciples) while disciples won't die but will trade places. Ultimately, their souls are eternal and will not perish.
I forget which scripture but (I believe in Ezekiel) it talks about how the world will end when the entire Bible is complete (ie. when everything the Bible teaches will happen has happened, so it isn't needed on Earth anymore). So we, therefore, understand that the world has a set expiry date that no one actually knows, and so in that humans may come and go throughout the period of time and never experience that expiry date.
This all comes from a Biblical standpoint and ultimately, the short answer is - humans are innately evil with a conscious which tells them to do good.