Saints perform miracles at times, however miracles are not necessary a condition of Sainthood. The Saints (Awliya) regard obeying the Shari’ah conscientiously as the biggest miracle. Ghaual A’zam said: “The miracle of a Wali is his complete compliance to the teachings of Nabi (sallal laahu alaihi wasallam)”.
Sheikh-e- Akbar, Muhayyuddin Muhammed Ibnul Arabi (radi Allahu anhu) explains the phenomenon of miracles. One type of miracle is the Hissi (apparent) miracle, that is, it is evident and clearly seen by the general public. For example, flying in the air, walking on water, fore-telling the future, traversing hundreds of miles in one step. Another type of miracle is the Ma’nawi (spiritual) miracle, which can only be seen and perceived by special people. For example, control of carnal desires, adopting virtues by Divine Guidance, refraining from bad habits, practicing all Waajibaat (compulsory acts) punctually and diligently. These types of miracles do not contain any connivance while it is probable those Hissi miracles to contain connivance. (Futuhaate Makkiyah, Vol. 2, pg. 488)
The steadfast adherence to the Shari’ah is the best Karaamat. A true Saint is righteous and follows the path laid down by Nabi (sallal laahu alaihi wasallam).
Hazrat Bayazid Bustaami (radi Allahu anhu) cautions us: “If you see a person sitting cross-legged in the air, don’t be fooled by his act! Observe his approach/attitude to the compulsory acts (Fardh, Waajib) and prohibited acts (Haraam, Makruh Tahreemi) and detestable acts (Makrooh) and other restrictions and etiquette’s of the Shari’ah”. (Risaalah Qushayriya, pg. 81)