INSIDIOUS WAYS by Michael Smith

In•sid•i•ous 

Intended to entrap or beguile, stealthily treacherous or deceitful: an insidious enemy.

Operating or proceeding in an inconspicuous, subtle or seemingly harmless way but actually with grave effect:

Awaiting a chance to entrap

Working or spreading harmfully in a subtle or stealthy manner

“If something is slowly and secretly causing harm, it's insidious — like the rumors no one seems to listen to until suddenly someone's reputation is ruined. Insidious is related to the Latin noun, īnsidiae meaning "ambush" which comes from the Latin verb, īnsidēre "to lie in wait for." This is very fitting as an insidious rumor or problem is one whose negative effect is not realized until the damage is already done”
source:Vocabulary.com

Someone can be insidious, lurking subtly and we not be aware. We are not to go about suspicious of everyone, looking for the devil in all things but we are to be aware and listen to the Holy spirit concerning those in whom we relate. In todays narcissistic and evil world there are those who can knowingly or unknowingly do much harm to the naive and unsuspecting. 

Jesus commanded His disciples to watch out for those spreading or teaching their hypocrisies.
And He was giving orders to them, saying, “Watch out! Beware of the leaven of the Pharisees” Mark 8:15
Then they understood that He did not say to beware of the leaven of bread, but of the ‘teaching’ of the Pharisees and Sadducees. Matt. 16:12
He began saying to His disciples first of all, “Beware of the leaven of the Pharisees, which is hypocrisy. Luke 1:1
And Jesus said to them, “Watch out and beware of the leaven of the Pharisees and Sadducees.” Matt. 16:6

We are to be aware as Jesus was aware of the intentions of those meaning harm through their insidious ways.

But Jesus, aware of this, withdrew from there. Matt. 12:15

But Jesus, aware of this, said, Matt. 16:8

Immediately Jesus, aware in His spirit that they were reasoning that way within themselves, *said to them, Mark 2:8

For he was aware that the chief priests had handed Him over because of envy. Mark 15:10

The Holy Spirit can and will guide us into all truth. Trust Him, watch out and be aware for there are those who operate in insidious ways.