There is something about my prayer space being “ritually” pure that makes sense. So when I read this being a concern when involved in warfare I connected right away.

If a man becomes unclean because he has had a wet dream during the night, he is to go outside the camp and stay there. Toward evening he is to wash himself, and at sunset he may come back into camp. Keep your camp ritually clean, because the Lord your God is with you in your camp to protect you and to give you victory over your enemies. Do not do anything indecent that would cause the Lord to turn his back on you. – Deuteronomy 23:10-11, 14  GNT

If God walks in my space and my space is “holy” why would I be practicing anything that would “unwelcome” His presence?

I want to have God’s favour in all I do. As I practice keeping my space holy it is here that I can practice praying for mercy.

A good person will never fail;
    he will always be remembered. – Psalm 112:6 GNT

God hears my prayer and rewards me. If my reward is to be remembered it is only because as I receive God’s mercy and have been ready to show the same mercy to others.

So my purpose is clear when I come into my space to pray.

The Sovereign Lord has taught me what to say,
    so that I can strengthen the weary.
Every morning he makes me eager
    to hear what he is going to teach me. – Isaiah 50:4 GNT

My task is to take the truths that God has shared with me and go. Go to comfort the broken hearts, those who are tired of sin, and those harassed by trouble. The Holy Spirit wakens me each day to pray and then to go and preach the gospel. I receive from Him so that I can deliver the word of God.

Again (I speak now with especial respect unto him in heaven); the glory of his presence, as God and man eternally united; the discharge of his mediatory office, as he is at the right hand of God; the glory of his present acting for the church, as he is the minister of the sanctuary and the true tabernacle which God hath fixed and not man; the love, power, and efficacy of his intercession, whereby he takes care for the accomplishment of the salvation of the church; the approach of his glorious coming unto judgment, — are to be the objects of our daily thoughts and meditations. Let us not mistake ourselves. To be spiritually minded is, not to have the notion and knowledge of spiritual things in our minds; it is not to be constant, no, nor to abound, in the performance of duties: both which may be where there is no grace in the heart at all. It is to have our minds really exercised with delight about heavenly things, the things that are above, especially Christ himself as at the right hand of God. – John Owen