how good do you have to be to go to heaven?

my pastor started the service with this question on sunday. i didn't know there's a standard on how good you have to be. i thought as long as you believe in God, you go to heaven. i must say i was a little confused. we went through philipians chapter 3 going over Paul's message on following Christ. I found this passage to be very powerful and there are ppl out there really need to hear it

"brothers, i do not consider myself yet to have taken hold of it. but one thing i do: forgetting what is behind and straining toward what is ahead, I press on toward the goal to win the prize for which God has called me heavenward in Christ Jesus. All of us who are mature should take such a view of things. and if on some point you think differently, that too God will make clear to you. Only let us live up to what we have already attained". (Philipians 3, 13-16)

there are ppl in this world keep judging other's behavior and hold grudges on what has happened in the past. I must admit I sometimes do, too. but I realized i must let go of the past and stop looking at other's fault, so my life can move forward. i can only live up to what i think is righteous, and to me that would be God's standard. i can't make everyone happy, but God knows i'm trying and my fault is nailed with him on the cross. to be saved by God is the most comforting thing. I pray that I will live a life to glorify God through my faith in action.