How blessed are those who observe His testimonies, Who seek Him with all their heart.” (Psalm 119:2, NASB95)

The psalmist (David?) seems to be equating observing “His testimonies,” with seeking “Him with all their heart.” In other words, we demonstrate or practice seeking the Lord with all our heart when we observe his testimonies.  There is an unbreakable connection between obedience to God and pursuit of God.