Note 2 at Mk. 6:5: This verse says that Jesus could do (not would do) no mighty work, showing that He was hindered in doing what He willed to do by "their unbelief" (Mt. 13:58). Some degree of faith must be present in the person receiving the miracle in order for God to do the work (see note 2 at Lk. 7:13, p. 116; see note 1 at Lk. 8:45, p. 157; see notes 1-2 at Lk. 8:50-51, p. 159).

It is God's will that no one should perish (Jn. 3:16 with 2 Pet. 3:9), but many do because of their unbelief. Likewise, it is God's will that we all be healed (3 Jn. 2; see notes 1-2 at Mt. 8:16-17, p. 68), but not all are healed because we fail to believe (Heb. 4:2). It is a mistake to assume that whatever God wills will automatically come to pass. We play a part in receiving from God. If Jesus, who had no limitations, couldn't do all the mighty works He desired to do because of other people's unbelief, then most certainly, we have to take into account the level of the peoples' faith whom we minister to. This is the reason Jesus sought seclusion when performing certain miracles (see note 2 at Lk. 8:51, p. 159).

Compare with Deuteronomy 7:17 where the Lord told the children of Israel that if they doubted in their heart, He could not perform His promises to them (Num. 33:53) of dispossessing the nations in the promised land.