Romans 2:6-8 ESV<quoted text>
Christians are motivated by Christ's perfect, sacrificial love.
I John 4:18
"There is no fear in love, but perfect love casts out fear. For fear has to do with punishment, and whoever fears has not been perfected in love."
He will render to each one according to his works: to those who by patience in well-doing seek for glory and honor and immortality, he will give eternal life; but for those who are self-seeking and do not obey the truth, but obey unrighteousness, there will be wrath and fury.
Deuteronomy 28:47-48 ESV
Because you did not serve the Lord your God with joyfulness and gladness of heart, because of the abundance of all things, therefore you shall serve your enemies whom the Lord will send against you, in hunger and thirst, in nakedness, and lacking everything. And he will put a yoke of iron on your neck until he has destroyed you.
True altruism is impossible when performed under the precept of religion.