In order to worship God, you must know God. In order to know God, you must recognize His unity. In order to recognize His unity, you must deny any possibility of describing how God is present, where He is present, and when He is present.
It is through God that you can be guided towards Him. And to obtain this guidance you may seek His permission to find Him. When He grants this permission, you recognize His unity. Recognizing His unity is the essence of faith in God. Faith in God leads to knowledge of God. Knowledge of God implies obedience to His commands. Obedience to God's commands is the means whereby you ascend towards Him. And by ascending towards God you will eventually reach Him.
When God has made Himself manifest to you, then you can speak about Him. Yet in finding God you become bewildered; and this bewilderment is so great, that it removes any possibility of speaking coherently. Thus the true worshiper of God, who has encountered Him directly, is unable to describe Him.
(Junayd)