Is there a criterion for determining whether an act is considered major shirk (associating partners with Allah) or minor shirk?

Question:
Honorable Shaykh, may Allah grant you success, the questioner asks: Is there a criterion for determining whether an act is considered major shirk or minor shirk?

Answer:
If it is a type of worship and it is directed to other than Allah, that is major shirk: slaughtering for other than Allah, making a vow for other than Allah, supplicating to other than Allah. This is major shirk. Any type of worship, if done for other than Allah, is first of all major shirk. As for swearing by other than Allah, as for showing off in worship, as for saying "if not for Allah" or "what Allah willed," all of this is minor shirk.