Mark 11:23

verily I say unto you With great solemnity He seeks to impress upon them a truth which would be of the greatest import to them, when they went forth, as His Apostles, to establish and spread His kingdom that an unfaltering faith in God would overcome all difficulties, even the most insuperable to the eye of sense.

shall say unto this mountain Language like this was familiar in the schools of the Jews. They used to set out those teachers among them, that were more eminent for the profoundness of their learning, or the splendour of their virtues, by such expressions as these, "He is a rooter upor remover of mountains." "They called Rabbah Bar Nachmani, A rooter up of mountains, because he had a piercing judgment." Lightfoot, Hor. Heb.

shall not doubt in his heart The word here translated "doubt" (a) in the active voice means to discriminate, distinguish, discern,as Matthew 16:3, "ye can discernthe face of the heaven;" Acts 15:9, "He put no differencebetween us and them;" 1 Corinthians 11:29, "not discerningthe Lord's Body." (b) In the passive and middle voice, it means (i) to get a decision, to go to law, to dispute, as Acts 11:2, "they of the circumcision contendedwith him;" James 2:4, "are ye not partial(become litigantsor partisans) in yourselves?" (ii) to dispute with oneself, to doubt, waver, as Acts 10:20, "go with them, doubting nothing;" Romans 4:20, "he staggered notat (i. e. with regard to) the promise through unbelief;" James 1:6, "but let him ask in faith, nothing wavering;for he that waverethis like a wave of the sea."