The Abrahamic sacrifice of his son.

[WinterHold]

If it's sufficient; there won't be a "but with".

Ok so what happens if people read Quran heedlessly and don't reflect?
Because part of it's paradigm is that reflection is required for guidance.

I'll quote the Quran to answer you:

Sura 2, The Quran:
( 213 )   Mankind was [of] one religion [before their deviation]; then Allah sent the prophets as bringers of good tidings and warners and sent down with them the Scripture in truth to judge between the people concerning that in which they differed. And none differed over the Scripture except those who were given it - after the clear proofs came to them - out of jealous animosity among themselves. And Allah guided those who believed to the truth concerning that over which they had differed, by His permission. And Allah guides whom He wills to a straight path.

God will guide those who try. Try your best; read; if you catch the prophet alive follow him; if he's dead look for the scripture that was given to him. This is what the verse says. Literally.

Does the above, relates to the Shiite faith?

So it is sufficient to guide us or are we required to reflect and use our minds?

Verse 213 of Sura 2 said:

out of jealous animosity among themselves. And Allah guided those who believed to the truth concerning that over which they had differed, by His permission. And Allah guides whom He wills to a straight path.

I would say one should remove jealousy off their hearts, rely on God to guide them. He will guide whom he wills.

Ok suppose it is not sufficient, the issue God is sufficient as a Guide.

He is the reliable support. In the past, scriptures along with Ahlulbayts like the family of Abraham was always the way, but from some reason, Mohammad's family you think is undermining revelation, when rather, it's the way God makes sure revelation to be followed not according to whim but insight.

I didn't understand the first line.
No. Always God alone was the source of guidance. He guides; we choose.