Then said he unto the disciples, It is impossible but that offences will come: but woe unto him, through whom they come! Luke 17:1 The enemy will do everything possible to offend; and frustrate a believer. Most times he will do it through individuals that are closer to his target; the enemy can use one's spouse, siblings, parents etc. It's important to note that the enemy (Satan) can only work through a heeded bodies. Romans 12:1 admonish us to submit our bodies to God: now, if we do not submit to God volitionally, the enemy will creep in and manipulate you into using your body either consciously or unconsciously to offend mostly the believers, others can be victims of such act as well. But the main subject is the believers. Reasons? to frustrate and hinder them in any way possible. The Holy Bible records it that Jesus Christ said "Woe" to such individuals through whom the offense will come. Believe it, you don't want to be on the 'woe' side life against ...
"But if our gospel be hid, it is hid to them that are lost:" 2 Corinthians 4:3