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чужая душа – потёмки stresses
gen.	one cannot know the inside of a man's mind; nobody can tell what goes on in another person's mind
Makarov., proverb	the human heart is a mystery
proverb	one cannot know the inside of a man's mind; still waters run deep (you cannot tell what goes on in other people's hearts and minds); you can't tell a book by its cover; another man's soul is always dark; another man's mind is a closed book; other people always remain dark horses
Чужая душа – потёмки
proverb	you can't read another man's soul; a stranger's heart is a deep well -it's too dark there to see well
чужая душа-потёмки
gen.	another man's mind is a closed