be deeply grateful; be very much obliged; cannot be more grateful; feel very much indebted; owe endless (/boundless) gratitude to ❍ 三藏～，将包袱捎在马上，牵着缰绳，相随老叟径出了坑坎之中，走上大路。(《西游记》173) Tripitaka could not be more thankful.Fastening the bundles on the saddle and leading his horse,he followed the old man out of the pit and walked toward the main road.