How?

Psalm 119:9-16 (NIV)
How can a young person stay on the path of purity? By living according to your word.

I seek you with all my heart; do not let me stray from your commands.
I have hidden your word in my heart that I might not sin against you.
Praise be to you, Lord; teach me your decrees.
With my lips I recount all the laws that come from your mouth.
I rejoice in following your statutes as one rejoices in great riches.
I meditate on your precepts and consider your ways.
I delight in your decrees; I will not neglect your word.