John Trapp on Isaiah 48:17

Ver. 17. I am the Lord thy God which teacheth thee to profit] And do therefore ſo oft call upon thee to hear me, not for any benefit to my ſelf but to thee alone. And the truth is, In all the Commandements of God, if they were open to us, if we did ſee the ground of them, we ſhould ſee there were ſo much reaſon for them, and ſo much good to be got by them, that if God did not command them, yet it would be beſt for us to practiſe them.

Which leadeth thee by the way that thou ſhouldeſt go] Heb. making thee to tread in the way thou ſhalt walk, carefully chuſing thy ſteps for thee, and ſetting thy foot right: thus he led Joſeph like a ſheep, Pſal. 80.2. and Iſrael through the deep as an horſe in the wilderneſſe that they ſhould not ſtumble, Iſa. 63.13. Thrice happy are the Saints in ſuch a guide. The ſteps of a good man are ordered by the Lord, and he delighteth in his way, Pſal. 37.23.