Jamieson, Fausset & Brown

we walk--in our Christian course here on earth. not by sight--Greek, "not by appearance." Our life is governed by faith in our immortal hope; not by the outward specious appearance of present things [TITTMANN, Greek Synonyms of the New Testament]. Compare "apparently," the Septuagint, "by appearance," Num 12:8. WAHL supports English Version. Co2 4:18 also confirms it (compare Rom 8:24; Co1 13:12-13). God has appointed in this life faith for our great duty, and in the next, vision for our reward [SOUTH] (Pe1 1:8).