Wherewithal shall a young man cleanse his ways?

Psalm 119:9-16
9 Wherewithal shall a young man cleanse his way? by taking heed thereto according to thy word.
10 With my whole heart have I sought thee: O let me not wander from thy commandments.
11 Thy word have I hid in mine heart, that I might not sin against thee.
12 Blessed art thou, O LORD: teach me thy statutes.
13 With my lips have I declared all the judgments of thy mouth.
14 I have rejoiced in the way of thy testimonies, as much as in all riches.
15 I will meditate in thy precepts, and have respect unto thy ways.
16 I will delight myself in thy statutes: I will not forget thy word.