greatness of ... way - the length of thy journey in seeking strange gods, or else foreign aid (Jer 2:23, Jer 2:24). Notwithstanding thy deriving no good from these long journeys (so, “send ... far off,” Isa 57:9), thou dost not still give up hope (Jer 2:25; Jer 18:12).
hast found ... life of ... hand - for “thou still findest life (that is, vigor) enough in thy hand” to make new idols [Maurer], or to seek new alliance (“hand” being then taken for strength in general).
grieved - rather, “therefore thou art not weak” [Maurer]; inasmuch as having “life in thy hand,” thou art still strong in hope.