The opposite of temporary is permanent. Therefore, the analogy would be completed by saying "permanent" for the word that is the opposite of durable.
Transcendentalism.
"as a diplomat bridging divides"
abate : increase
The word set that completes the analogy is "tough love." This pairing represents a balance between strictness and kindness, where one can show compassion while still being firm and decisive.
The analogy would be perception : sensitivity :: insensitivity : callousness. Just as sensitivity is a heightened awareness or responsiveness, callousness is a lack or disregard for the feelings or well-being of others.
Permanent. The progression is from temporary (lasting for a short time) to durable (lasting for a long time) to permanent (lasting indefinitely).
The word "pliable" completes the analogy. Rigid is to flexible as inflexible is to pliable.
The word set that completes the analogy is incapable capable.
Transcendentalism.
Freud.
confidential : secret A+
"as a diplomat bridging divides"
abate : increase
fortress
What anol
Reproach : praise completes the analogy.