Judah did not recognise Tamar and assumed her to be a harlot, because she had the customary face covering. He thought he was committing one sin knowingly, but he was unknowingly committing another even more disgraceful sin.
How many advantages in life can be thrown away, and a person can plunge themselves into unknown depths of sin, without bothering to reckon how they will ever be extracted from such a pit. The children of believers have unique opportunities to seek and find the Lord, and Judah had these. His younger brother was an example to him but one which he chose to ignore. God was going to deliver Judah from this awful state, but Judah could not count on this as he went deeper and deeper into depravity. There is a terrible recklessness about sin which shuts out any thought of consequences. None deserve to be delivered from it but God’s grace is nonetheless going to be displayed in Judah’s life.
How much harm the wrong choice of friends can do us. Those who wish to give free reign to their lusts are careful to choose friends who will do nothing to dissuade them. They will hear nothing from such friends that will awaken conscience, or do anything to remind them of God’s standards. Yet that is the office of a true friend. A true friend is not concerned about immediate approval; he looks beyond that to the long term good. ‘Faithful are the wounds of a friend; but the kisses of an enemy are deceitful’ (Proverbs 27:6). Where were the faithful warnings and the sharp reproofs that Judah needed? Even a soft word of reproof can do a lot of good. The conscience is easily awoken. Of course, to rebuke a friend who is expected to countersign every lust may be the cause of such offence that friendship is severed.