When it comes to a stigma of mental illness on my life, the following verses have been encouraging:
"For if we are beside ourselves, it is for God; but if of sound mind, it is for you." (2 Corinthians 5:13)
"For God has not given us the spirit of fear, but of power and of love and of a sound mind." (2 Timothy 1:7)
In being accused of insanity, I am in good company:
"And as he thus spake for himself, Festus said with a loud voice, Paul, thou art beside thyself; much learning doth make thee mad. But he said, I am not mad, most noble Festus, but speak forth the words of truth and soberness." (Acts 26:24-25)
"And when his (Jesus') friends heard of it, they went out to lay hold on him: for they said, He is beside himself." (Mark 3:21)
"And many of them said, He (Jesus) hath a devil, and is mad; why hear ye him? Others said, these are not the words of him that hath a devil. Can a devil open the eyes of the blind?" (John 10:20-21)
"They were stoned, they were sawn asunder, were tempted, were slain with the sword: they wandered about in sheepskins and goatskins; being destitute, afflicted, tormented; (Of whom the world was not worthy they wandered in deserts, and in mountains, and in dens and caves of the earth..." (Hebrews 11:37-38)
EDITED to remove verses taken out of context that really do not relate to mental illness. Mental illness is that...an illness, and no one is after believers to institutionalize them just for being Christians.
Isaiah 57:18. "I have seen his ways, and will heal him: I will lead him also, and restore comforts unto him and to his mourners."