His word keeps us pure, and for that we must preserve spiritual purity and keep alert according to his will.
True happiness lies in his walk, if we do so, Jehovah will consider us exempt from fault (Psalm 119: 1). This does not mean that we are perfect, but that we do our best to do his will.
This is demonstrated by the example of Noah, who was exempt from lack among his contemporaries because he walked "with the true God". That faithful patriarch and his family survived the Flood by being obedient to Jehovah (Genesis 6: 9, 1 Peter 3:20). In the same way, for Christians to survive the end of this world, they must carefully keep God's orders, that is, to do His will (Psalm 119: 4).
Another example was the case of Hezekiah, who 'cleansed his path' of pagan influences, even though his father was an idolater.
Then he must repent, pray and ask for help from his parents and Christian elders. In this way he will act like Hezekiah: he will stay "alert" and "cleanse [...] his path" (James 5: 13-15).
To be faithful to Jehovah it is fundamental to care for his word, we must have inspired the ardent desire to understand the wonderful things of God's law, to crave his judicial decisions all the time and to delight in his reminders (Psalm 119: 18, 20, 24).
Following their messages instills the necessary courage to face the challenges of life and thus achieve happiness.
