know by heart

Also found in: Idioms.
References in periodicals archive ?
Andrew's Anglican Church in Calgary that I attend, the priest lifts up the host and wine for everyone to see, but most of the congregants are looking at the words in the Book of Alternative Services eucharistic prayer they already know by heart.
I pray that before he meets these real wild things--the needy girlfriend, the addict friend--he will come to know by heart the one who feeds us, but does not feed on us.
WB: Probably not, but I had to pick a prayer that most readers would know by heart in order for the lampooning to work.
It's only taken us 25 years, but it's the only song we now know by heart.