Source identified1
“The purpose of life is unquestionably unfoldment, growth, advancement”
Trine states his view of purpose directly: life should continue to develop rather than settle into mental or moral stagnation.
Source note: The Higher Powers of Mind and Spirit; Project Gutenberg #28163. The surrounding text describes evolution from “lower” to “higher” in spiritual terms; this is Trine’s philosophical-religious position, not a scientific law of human development.
Source identified2
“There are moments in the lives of all of us when we catch glimpses of a life—our life—that is infinitely beyond the life we are now living.”
The opening image treats dissatisfaction with present limits as awareness of unrealized possibility, turning a glimpse of a better life into a reason for deliberate development.
Source note: The Higher Powers of Mind and Spirit, Chapter I; Project Gutenberg #28163. The work is New Thought writing and later makes metaphysical claims about mind and spirit; this record uses the passage as historical self-development rhetoric, not modern psychological science.