John Gill Commentary Job 37:19

"Teach us what we shall say unto him; [For] we cannot set [our speech] in order by reason of darkness." — Job 37:19 (ASV)

Teach us what we shall say unto him
To this wonder working God, of whose common works of nature we know so little; how we should reason with him about his works of Providence, when we know so little of these:

[for] we cannot order [our speech] by reason of darkness ;
by reason of darkness in themselves, which is in all men naturally, and even in the saints in this state of imperfection;

and by reason of the clouds and darkness which are about the Lord himself, who is incomprehensible in his nature and perfections; and by reason of the darkness cast about his providential dealings with men, so that they are unsearchable and past finding out; and the best of men are at a loss how to order their speech, or discourse with God concerning these things.