Jesus replied, “Work hard"... to enter the narrow door to God’s Kingdom, for "many will try to enter".... but will fail. (Luke 13:23,24)
"Work hard to show the results of your salvation", OBEYING God with deep REVERENCE and FEAR. For God is working in you, giving you the desire and the power (for you) TO DO.... what pleases Him. (Philippians 2:12,13)
By grace through faith in Jesus - we are saved. BUT.. do not expect God to do your part for you -
Then Peter continued preaching for a long time, strongly urging all his listeners....
“Save... yourselves" from this crooked age!” (Acts 2:40)