LVX23 provides the exact reference in Comment 24 of Philip K. Dick’s Exegesis:
The disciples said to Jesus, “Tell us what Heaven’s kingdom is like.” He said to them, “It’s like a mustard seed, the smallest of all seeds, but when it falls on prepared soil, it produces a large plant and becomes a shelter for birds of the sky.” (Gospel of Thomas)
March 24, 2006 at 9:35 pm
im not 100% sure
but jesus wasn’t talking about heaven he was talking about faith
perhaps your quote is wrong