It is the goodness of God that leadeth to repentance:
Romans 2:4
Or despisest thou the riches of his goodness and forbearance and longsuffering; not knowing that the goodness of God leadeth thee to repentance?

Not fear of punishment, because
1 John 4:18
There is no fear in love, but perfect love casts out fear; for fear has torment, and he that fears has not been made perfect in love.

and
1 John 4:16
And we have known and have believed the love which God has to us. God is love, and he that abides in love abides in God, and God in him.

We can know the will of the Lord.
Ephesians 5:9
Wherefore be ye not unwise, but understanding what the will of the Lord is.