Sanctify = Hallow. Greek. hagiam. Separation is the idea of the word "holy". See note on Exo_3:5.
Thy. All the texts read "the".
truth. The truth is the great separating force. Compare Mat_10:35.
Thy word, &c. = The word that is Thine is the truth. The Incarnate and revealed Words alike. Compare Joh_6:33; Joh_14:6; Joh_16:13. Mat_22:16. 2Co_6:7; 2Co_13:8. Gal_1:2, Gal_1:5, Gal_1:14. Eph_1:13.