Right 

"if your so called friends urge you to do anything

 you know to be wrong

 you be the one to make a stand for right 

even if you stand alone

 have the moral courage 

to be a light for others to follow" 

- Thomas s. Monson 

what i think this quote means or what its trying to have you understand is that there will be a time where you have friends its a time everyone will encounter in life as you grow up you find the real ones and the liars the ones you cherish deeply and others you wish to escape even some you grow to love so much you cant stop smiling or as again others you really hate, all you have to do is choose who you will find yourself whether its both one or none doesnt matter how when or where always make sure your happy around them and if your not leave them for they will lead you a path of tragity.

and by what it means by "be a light for others to follow" in my opinion it says if your alone with no one to turn to find you other speck of light from then on even if its one or two even four or five friends! or less they make you feel so happy you cant stop smiling trust me im in that happy place now and i wish to never ever let them go psh! not on my watch i will die without them!