ἐν ταῖς ἀνάγκαις χρημάτων κρείττων φίλος → it is better in times of need to have friends rather than money, a friend in need is a friend indeed (Menander, Sententiae monostichoi 143)
See walk.
on foot: P. and V. πεζός.
walking the earth: V. πεδοστιβής, χθονοστιβής.