Because God is holy the utmost reverence becomes our approaches unto Him (Psalm 89:7; 99:5). Yes, “at His footstool”, in the lowest posture of humility, prostrate before Him. When Moses would approach unto the burning bush, God said “Put off thy shoes from off thy feet” (Exodus 3:5). He is to be served “with fear” (Psalm 2:11). Of Israel His demand was, “I will be sanctified in them that come nigh to Me, and before all the people I will be glorified” (Leviticus 10:3). The more our hearts are awed by His ineffable holiness, the more acceptable will be our approaches unto Him.
Pink, Arthur W.; The Attributes of God; Kindle Edition; page 43