I feel that if I kept it secret it might grow in my mind (as poisonous things grow in the dark) and take its place with the other terrible thoughts that gnaw me
As long as you don't fly openly in the face of society, society doesn't ask any inconvenient questions; and it makes precious short work of the cads who do. There are no secrets better kept than the secrets everybody guesses.
The powers of the mind should be concentrated and the mind turned back upon itself; as the darkest places reveal their secrets before the penetrating rays of the sun, so will the concentrated mind penetrate its own innermost secrets.
If someone hacks your password, you can change it - as many times as you want. You can’t change your fingerprints. You have only ten of them. And you leave them on everything you touch; they are definitely not a secret.