And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption. Grieve not the Holy Spirit of God - By giving way to any wrong temper, unholy word, or unrighteous action. Even those who have already a measure of the light and life of God, both of which are not only brought in by the Holy Spirit, but maintained by his constant indwelling, may give way to sin, and so grieve this Holy Spirit that it shall withdraw both its light and presence; and, in proportion as it withdraws, then hardness and darkness take place; and, what is still worse, a state of insensibility is the consequence; for the darkness prevents the fallen state from being seen, and the hardness prevents it from being felt.
Whereby ye are sealed - The Holy Spirit in the soul of a believer is God's seal, set on his heart to testify that he is God's property, and that he should be wholly employed in God's service. It is very likely that the apostle had in view the words of the prophet, Isaiah 63:10 : But they rebelled, and Vexed his Holy Spirit; therefore he was turned to be their enemy, and fought against them. The psalmist refers to the same fact in nearly the same words, Psalms 78:40 : How oft did they Provoke him in the wilderness, and Grieve him in the desert! Let every man, therefore, take heed that he grieve not the Spirit of God, lest God turn to be his enemy, and fight against him.