Still it may be asked, what is the use of prayer at all, whether made in words or in meditation of things, if God knows already what is necessary for us?

The mental posture of prayer calms and purifies the soul, and makes it of more capacity to receive the divine gifts which are poured into it.

For God does not hear us for the prevailing force of our pleadings; He is at all times ready to give us His light, but we are not ready to receive it, but prone to other things.

​There is then in prayer a turning of the body to God, and a purging of the inward eye, whilst those worldly things which we desired are shut out, that the eye of the mind made single might be able to bear the single light, and in it abide with that joy with which a happy life is perfected.

Consider how you live by studying Scripture, pondering it with prayer, loving what it teaches so much that you are constantly thinking about it and talking to God about it. This will transform what you are. 

As a result, you will have clarity about what matters. It will purify your desires, your goals, your motivation because you will live with a better sense of the plans and purposes of God. 

This world will matter less to you, things temporal, earthly, and mortal will be subordinated in your heart to things eternal, heavenly, and immortal. 
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And in a time when few look at life the right way, you will know how to best use your time, you will make better choices, and you will live for what really matters:  the will of God. This is wise conduct.