The purpose of the journey upward (see:Moses) is to be alone with the Lord; no distractions or other passions. Until our passions are eliminated we will not arrive at the top, no matter how much virtue we practice.
Leave Everything Behind
If I am to make this journey to meet,talk, and join with You I must bring nothing with me. The purpose of the journey is to be alone with God with nothing but the desire to be with Him.