It is easy to do bad than to do good.

We were all borned with the sinful nature so it is natural for us do the things that are sinful in the sight of God.

However, Christ put to death this sinful nature at the cross and He rose to give us a new life in Him.

Therefore, similar to Nichodemus we must be born again to received the new sinless nature of Christ.

This newbirth is spiritual and when we receive it we will be transformed into the image and likeness of Jesus Christ.

Thus, doing good will become a natural part of us because we have become new and old things are passed away.

AMEN! Glory to God!

Knowing that Christ being raised from the dead dieth no more; death hath no more dominion over him.

¹⁰ For in that He died, He died unto sin once: but in that He liveth, He liveth unto God.

¹¹ Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.

¹² Let not sin therefore reign in your mortal body, that ye should obey it in the lusts thereof.

¹³ Neither yield ye your members as instruments of unrighteousness unto sin: but yield yourselves unto God, as those that are alive from the dead, and your members as instruments of righteousness unto God.

¹⁴ For sin shall not have dominion over you: for ye are not under the law, but under grace. (Romans 6:10-14) 

Additional reading: John 3