Seeking signs (metaphysical) is intrnsic

And they swear their strongest oaths by Allâh, that if there came to them a sign, they would surely believe therein. Say: "Signs are but with Allâh and what will make you (Muslims) perceive that (even) if it (the sign) came, they will not believe?"

Al an'aam 109

Comment
There is an anology between those who used to seek sign from Prophets as a proof and those who seek a sign from the Auliya (Saints) of the nation of Seal of Prophets Syedna Muhammad Salla'l la ho alaye hi wasallm.Therefore saints ,specially of Nqshabndi way advise that the real sign of wilayat (sainthood) is to avoid sins and to keep following the divine guidance constantly.