quote attribution ("prisoners in a garden of our own making")

Late (too late) last night I finished watching the documentary series The Deep End about Teal Swan. Near the end of the last/fourth episode, the PI says the following:

When we only do things that please us and don’t frighten us, over time fewer and fewer things please us, until we find ourselves prisoners in gardens of our own making.

That resonated with me, but more to the point, it sounded very familiar. Google (and Bing and Duckduckgo) did not help me find the source, sadly (probably because none of them handle long strings of text well). I kept finding stuff about prisons, prisoners, gardens, and prison gardens.

When I Googled only "fewer and fewer things please us," I found a few links about the PI in her role in The Deep End (and her frosted beer stein and tree frog)... and a few sermons (all using the same unattributed quote, and all from Unitarian Universalist churches, interestingly).

Since all search engines seem to give everyone slightly different results based on browser cookies, I don't know if anyone else would have better luck finding the origin of the quote than I had. (My browsers save no cookies and block trackers and ads.)

Does anyone know the true origin of the above quote? Thanks in advance to whoever may help