Because he hath inclined his ear unto me - See the notes at Psalm 5:1. Because he has been gracious to me, and has heard my prayers. This is a pood reason for serving God, or for devoting ourselves to him, but it is not the only reason. We ought to worship and serve God whether he hears our prayers or not; whether he sends joy or sorrow; whether we are favored with prosperity, or are sunk in deep affliction. People have worshipped God even when they have had no evidence that he heard their prayers; and some of the most pure acts of devotion on earth are those which come from the very depths of darkness and sorrow.
Therefore will I call upon him as long as I live - Margin, as in Hebrew, "in my days." Encouraged by the past, I will continue to call upon him in the future. I will retain a firm faith in the doctrine that he hears prayer, and I will express my practical belief in the truth of that doctrine by regular and constant habits of worship. When a man once has evidence that God has heard his prayer, it is a reason why he should always call on him in similar circumstances, for God does not change.

Because he hath inclined his ear - The psalmist represents himself to be so sick and weak, that he could scarcely speak. The Lord, in condescension to this weakness, is here considered as bowing down his ear to the mouth of the feeble suppliant, that he may receive every word of his prayer.
Therefore will I call upon him - I have had such blessed success in my application to him, that I purpose to invoke him as long as I shall live. He that prays much will be emboldened to pray more, because none can supplicate the throne of grace in vain.

Because he hath inclined his ear unto me, therefore will I call upon [him] (b) as long as I live.
(b) That is in convenient time to seek help, which was when he was in distress.

Because he hath inclined his ear unto me,.... Not as hard of hearing, for his ear is not heavy that it cannot hear; he is quick of hearing, and his ears are always open to the righteous; it rather denotes his readiness to hear; he hearkens and hears, he listens to what his people say, and hears them at once, and understands them, though ever so broken and confused; when their prayers are but like the chatterings of a crane or swallow, or only expressed in sighs and groans, and even without a voice; when nothing is articulately pronounced: moreover, this shows condescension in him; he bows his ear as a rattler to a child, he stoops as being above them, and inclines his ear to them.
Therefore will I call upon him as long as I live; or "in my days" (d); in days of adversity and affliction, for help and relief; in days of prosperity, with thankfulness for favours received; every day I live, and several times a day: prayer should be constantly used; men should pray without ceasing always, and not faint; prayer is the first and last action of a spiritual life; it is the first thing a regenerate man does, "behold, he prays"; as soon as he is born again he prays, and continues praying all his days; and generally goes out of the world praying, as Stephen did, "Lord Jesus, receive my spirit"; and it is the Lord's hearing prayer that encourages his people to keep on praying, and which makes the work delightful to them. Christ was often at this work in life, and died praying, Luke 6:12.
(d) "in diebus meis", V. L. Pagninus, Montanus, Junius & Tremellius, Piscator, &c.