The sun can warm the water making it pleasant to bathe or dry out the clay making it impossible to mold. Two people can hear the same news and be totally opposite in how they respond.
As humans,we can choose how to respond. It is not the fault of the sun, it is the sun’s characteristics and that of the clay that causes the hardening.
2 Corinthians 2:16 says the savour of the knowledge of Christ is the taste of life unto life to some and death unto death to others.