Siman 564

(121.) "Faith is the last level — and even so, through it specifically one ascends over all levels entirely. For faith is in the aspect of [Psalms 118]: 'The stone the builders rejected has become the cornerstone' — as is known." And as Rabbainu o.b.m. said in his holy conversations when he spoke with us after the Torah discourse "For He who has mercy on them will lead them" [Likutay Tinyana, Torah 7] — and he said then that faith is the last level, but through it one merits to ascend above all...