Psalms of Solomon 14:8
6 But it is not so with sinners and criminals, who love the time enjoying their sins. 7 Their enjoyment is brief and quickly decays, and they do not remember God. 8 Because he always knows how people live, and he knows the secrets of the heart before they happen. 9 Therefore there is reserved for them the world of the dead, darkness and destruction, and they will not be remembered on the day of mercy for the righteous, 10 but a happy life is reserved for the Lord's devout.
Matthew 6:8
6 But whenever you pray, go into your inner room, close the door, and pray to your Father in secret. And your Father, who sees in secret, will reward you. 7 When you pray, do not babble repetitiously like the Gentiles because they think that by their many words they will be heard. 8 Do not be like them, for your Father knows what you need before you ask him. 9 So pray this way: “Our Father in heaven, may your name be honored, 10 may your kingdom come, may your will be done on earth as it is in heaven.
Notes and References
"... Greek, 'the secret rooms of the heart'. Compare Genesis 43:30, Matthew 6:6 ..."
Wright, Robert B. The Psalms of Solomon: A Critical Edition of the Greek Text (p. 159) T&T Clark, 2007