Therefore - that is, In view of these benefits, or, Because of the glory of Thy law, so much praised in the previous parts of the Psalm.
I love ... [and] Therefore (repeated) - All its precepts, on all subjects, are estimable for their purity, and lead one imbued with their spirit to hate all evil (Psa 19:10). The Word of God admits of no eclecticism; its least title is perfect (Psa 12:6; Mat 5:17-19).