Taking Christian faith lightly

"The Lord is slow to anger and great in power, and will not at all acquit the wicked..." Nahum 1.3

That word is addressed to those who are take the Christian faith lightly. Especially for those who, claiming that God is love, are deliberately living in sin, as if the love of God would make Him tolerate sin or injustice.
The LORD is slow to anger and great in mercy and love, but never clears the guilty.

Feast

"Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth."

1 Corinthians 5:8

The Lord Supper is a celebration of the live presence of the Lord & Savior Jesus Christ in us. For this reason, it must be taken with a free conscience of all emotions and guilt.