In Paul's letter to Titus we find the follow words beginning in 3:3
3 For we ourselves were also once foolish, disobedient, deceived, serving various lusts and pleasures, living in malice and envy, hateful and hating one another. 4 But when the kindness and the love of God our Savior toward man appeared, 5 not by works of righteousness which we have done, but according to His mercy He saved us, through the washing of regeneration and renewing of the Holy Spirit, 6 whom He poured out on us abundantly through Jesus Christ our Savior, 7 that having been justified by His grace we should become heirs according to the hope of eternal life.
Please point out one single thing that was done by man to [become heirs according to the hope of eternal life]. Everything was accomplished by God alone!
Does this mean the requirements/actions by man were not mentioned just for ease of reading?
No Paul is saying we also were sinners, but look at what God did for us!