Lord, I believe. He declares that he believes, and yet acknowledges himself to have unbelief These two statements may appear to contradict each other, but there is none of us that does not experience both of them in himself. As our faith is never perfect, it follows that we are partly unbelievers; but God forgives us, and exercises such forbearance towards us, as to reckon us believers on account of a small portion of faith. It is our duty, in the meantime, carefully to shake off the remains of infidelity which adhere to us, to strive against them, and to pray to God to correct them, and, as often as we are engaged in this conflict, to fly to him for aid. If we duly inquire what portion has been bestowed on each, it will evidently appear that there are very few who are eminent in faith, few who have a moderate portion, and very many who have but a small measure.

Said with tears - The man felt the implied rebuke in the Saviour's language; and feeling grieved that he should be thought to be destitute of faith, and feeling deeply for the welfare of his afflicted son, he wept. Nothing can be more touching or natural than this. An anxious father, distressed at the condition of his son, having applied to the disciples in vain, now coming to the Saviour; and not having full confidence that he had the proper qualification to be aided, he wept. Any man would have wept in his condition, nor would the Saviour turn the weeping suppliant away.
I believe - I have faith. I do put confidence in thee, though I know that my faith is not as strong as it should be.
Lord - This word here signifies merely "master," or "sir," as it does often in the New Testament. We have no evidence that he had any knowledge of the divine nature of the Saviour, and he applied the word, probably, as he would have done to any other teacher or worker of miracles.
Help thou mine unbelief - Supply thou the defects of my faith. Give me strength and grace to put "entire" confidence in thee. Everyone who comes to the Saviour for help has need of offering this prayer. In our unbelief and our doubts we need his aid, nor shall we ever put sufficient reliance on him without his gracious help.

Lord, I believe - The word Lord is omitted by ABCDL, both the Syriac, both the Arabic later Persic, Ethiopic, Gothic, and three copies of the Itala. Griesbach leaves it out. The omission, I think, is proper, because it is evident the man did not know our Lord, and therefore could not be expected to accost him with a title expressive of that authority which he doubted whether he possessed, unless we grant that he used the word κυριε after the Roman custom, for Sir.
Help thou mine unbelief - That is, assist me against it. Give me a power to believe.

And straightway the father of the child cried out,.... As soon as ever he found it was put upon his faith, and that the issue of things would be according to that, he expressed himself with much vehemency, being in great distress; partly with indignation at his unbelief, and partly through fear of missing a cure, by reason of it:
and said with tears; repenting of his unbelief, and grieved at the present weakness of his faith; which he very ingenuously confesses, saying,
Lord, I believe, help thou mine unbelief; not forward, but out of the way: he found in himself some small degree of faith in the power of Christ, but it was mixed with much unbelief, through the greatness of the child's disorder; and therefore desires it might be removed from him, and he might be helped against it: he saw it was not in his own power to believe; nor had he strength of himself to oppose his unbelief; but that both faith must be given him, and power against unbelief. The Syriac version renders it, "help", , "the defect of my faith": till up that which is lacking in it, it is very deficient, Lord, increase it; and the Arabic and Ethiopic translate thus, "help the weakness of my faith". He found his faith very weak, he desires it might be strengthened, that he might be strong in faith, and give glory to God; and in this way belief is helped, or men helped against it: every believer, more or less, at one time or another, finds himself in this man's case; and also that it is necessary to make use of the same petition; for faith is but imperfect in this life, and often very weak and defective in its exercise.

And straightway the father of the child cried out, and said with tears, Lord, I believe: help thou mine unbelief--that is, "It is useless concealing from Thee, O Thou mysterious, mighty Healer, the unbelief that still struggles in this heart of mine; but that heart bears me witness that I do believe in Thee; and if distrust still remains, I disown it, I wrestle with it, I seek help from Thee against it." Two things are very remarkable here: First, The felt and owned presence of unbelief, which only the strength of the man's faith could have so revealed to his own consciousness. Second, His appeal to Christ for help against his felt unbelief--a feature in the case quite unparalleled, and showing, more than all protestations could have done, the insight he had attained into the existence of a power in Christ more glorious them any he had besought for his poor child. The work was done; and as the commotion and confusion in the crowd was now increasing, Jesus at once, as Lord of spirits, gives the word of command to the dumb and deaf spirit to be gone, never again to return to his victim.

Lord, I believe; help thou my unbelief. The spark of faith has been kindled; if his faith is not strong, he prays the Lord to give him stronger faith. So should always pray the doubting Christian. If your faith is weak, cry for help.

Help thou mine unbelief - Although my faith be so small, that it might rather be termed unbelief, yet help me.