[Rom 12:3-6 KJV]Rom 12:3 - maybe you think of yourself more highly than you ought to think
3 For I say, through the grace given unto me, to every man that is among you, not to think [of himself] more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
4 For as we have many members in one body, and all members have not the same office:
5 So we, [being] many, are one body in Christ, and every one members one of another.
6 Having then gifts differing according to the grace that is given to us, whether prophecy, [let us prophesy] according to the proportion of faith;
Correct @HeIsHere !Not a reference to saving faith.
Notice the idea of measurement, if there were measures of saving faith then people would have varying degrees of salvation.
This faith is for the use of gifts.
Next.
@BillyBob , you might want to at least read a few verses to get a feel for the context.