When the believer has begun with trembling feet to walk in the way of the Lord, he still asks to be led onward like a little child upheld by its parent's helping hand, and he yearns to receive further instruction in the alphabet of truth. Experimental teaching is the burden of this prayer. David knew much, but he felt his ignorance and desired to be still in the Lord's school: four times over in two verses he applies for a scholarship in the college of grace. It would be better for many professors if instead of following their own devices and cutting out new paths of thought for themselves, they would inquire for the good old ways of God's own truth and beseech the Holy Ghost to give them sanctified understandings and teachable spirits.
"For you are the God of my salvation." Jehovah is the Author and Perfecter of salvation to His people. Reader, is He the God of your salvation? Do you find in the Father's election, in the Son's atonement, and in the Spirit's quickening all the grounds of your eternal hopes? If so, you may use this as an argument for obtaining further blessings; if the Lord has ordained to save you, surely He will not refuse to instruct you in His ways. It is a happy thing when we can address the Lord with the confidence that David displays here; it gives us great power in prayer and comfort in trial.
"For you I wait all the day long." Patience is the fair handmaid and daughter of faith; we cheerfully wait when we are certain that we shall not wait in vain. It is our duty and our privilege to wait upon the Lord in service, in worship, in expectancy, in trust all the days of our life. Our faith will be tried faith, and if it is of the true kind, it will bear continued trial without yielding. We shall not grow weary of waiting upon God if we remember how long and how graciously He once waited for us.