Chasidut zu Tehillim 118:22

Faith is the last in the chain of all the spiritual qualities. Yet it is precisely through faith that one attains all other levels, for faith is “the stone that the builders rejected,” which “became the cornerstone” (Psalms 118:22). Along the same lines, the Rebbe said after teaching the lesson "כִּי מְרַחֲמֵם יְנַהֲגֵם" in Likutey Moharan II, 7 that faith is the last level, yet through faith one can rise to all levels and attain Desire, which is higher than everything else. See there in the Sichos that follow Sippurei Maasiyot (Sichos HaR"an 32) (Likutei Halachos Nedarim, Halachah 4, Ot 16)