Nay, we have heard it said that there is not a quaker or a baptist, a presbyterian or an episcopalian, a catholic or a protestant in heaven: that, on entering that gate, we leave those badges of schism behind, and find ourselves united in those principles only in which god has united us all. Let us not be uneasy then about the different roads we may pursue, as believing them the shortest, to that our last abode: but, following the guidance of a good conscience, let us be happy in the hope that, by these different paths, we shall all meet in the end. and that you and I may there meet and embrace is my earnest prayer: and with this assurance I salute you with brotherly esteem and respect.

Thomas Jefferson (1743-1826) American political philosopher, polymath, statesman, US President (1801-09)

Letter (1814-09-26) to Miles King
    (Source)

Where he had "heard it said" might be an 1813 letter from John Adams.