Can you use بِ and مِنْ to emphasize?

Yes, this is possible. Both – ب and the preposition مِنْ – can be used to give emphasis. Notice that the word which comes after بِ or مِنْ has to be مَجْرُور.

Let us have a look at some examples:

1

The letter ب

Travelling is not difficult at all.

لَيْسَ السَّفَرُ بِصَعْبٍ.

Allah is the best protector!
Note: The verb كَفَى basically means to be enough. However, it can also mean to protect; to spare. It is used without a preposition. The preposition ب here is used to emphasize.

كَفَى بِاللَّهِ  وَكِيلاً 

2

The preposition مِنْ

There has to be a singular اِسْم (noun) after it. Notice that there is no dif­ference in meaning whether the sentence is written with or without مِنْ – it is just the emphasis!

Nobody came to me.

ما جاءَنِي مِنْ أَحَدٍ.