Doing some homework for youth right now, covering Discipleship Essentials by Greg Ogden..
This, in my opinion, is quite a powerful psalm:
1 Blessed are those whose ways are blameless,
who walk according to the law of the LORD.
2 Blessed are those who keep his statutes
and seek him with all their heart—
3 they do no wrong
but follow his ways.
4 You have laid down precepts
that are to be fully obeyed.
5 Oh, that my ways were steadfast
in obeying your decrees!
6 Then I would not be put to shame
when I consider all your commands.
7 I will praise you with an upright heart
as I learn your righteous laws.
8 I will obey your decrees;
do not utterly forsake me.
9 How can a young person stay on the path of purity?
By living according to your word.
10 I seek you with all my heart;
do not let me stray from your commands.
11 I have hidden your word in my heart
that I might not sin against you.
12 Praise be to you, LORD;
teach me your decrees.
13 With my lips I recount
all the laws that come from your mouth.
14 I rejoice in following your statutes
as one rejoices in great riches.
15 I meditate on your precepts
and consider your ways.
16 I delight in your decrees;
I will not neglect your word.