Mi Yaaleh?

A dear friend is fond of citing the question of the meaning of 2 phrases in today's Shir Shel HaYom: "Who will go up on G-d's mountain?" "And who will stand in His place of holiness?" His take on the difference between the two phrases is as follows: The first line is saying that it's a major accomplishment to get to a G-dly place. The second phrase is telling us that it's an even greater feat to do the maintenance and make the holiness endure. He always adds that maybe this is why we pray these words on Sunday. On Shabbos we hopefully go up to the mountain of G-d, and the next day we start working on holding on to what we've achieved. May we be so blessed.