cause a pigeon to bring up the grain in its crop

mystery, secret, confidential, clandestine

a confidante

quietly, privacy, secrecy, keeping a secret, the action of keeping something secret or the state of being kept secret

confidant, one in the know of secrets, confidant, secret-keeper

secrecy

hiding secrets, keeping or concealing secrets

one who keeps or conceals a secret

acquainted with secret, the one who know the secrets of someone

decoder, secret revealer

in a secret manner

spill the beans, betray a secret

disclose a secret, let the cat out of the bag, spill the beans, betray a secret

revelation of secret

to expose a secret, to let out hidden details of something

knowing the secret

confidentially

confidante of one's yearning

a secret to be disclosed or leaked out

The prophets and the apostles.

voice of secret

a confidential paper

with the quality to keep secrets