And he saith unto him, Friend, how camest thou in hither not having a wedding garment? And he was speechless. – Matthew 22:12

The man came in full exercise of self-will and self-love. He resolved to yield no homage, but to assert his independent self-sovereignty. He would show the king even at his table, where his bounties were so largely dispensed, that he was not afraid to affront him. When he came to the door of the feast, he found the guests all putting on the garment suitable for the marriage banquet…While others cheerfully put on this wedding dress the traitor would not; he resolved to defy the rules of the palace, and to insult the king by appearing in his own garments. He scorned to wear the livery of respectful joy, he preferred to make himself conspicuous by his daring insolence. Alas, how many are willing enough to receive gospel blessings, but they are still at enmity with God and have no delight in the only begotten Son. Such will dare to use the forms of godliness, and yet their hearts are full of rebellion against the Lord. The wedding garment represents anything which is indispensable to a Christian, but which the unrenewed heart is not willing to accept, anything which the Lord ordains to be a necessary attendant of salvation, against which selfishness rebels. Hence it may be said to be Christ’s righteousness imputed to us, for alas, many nominal Christians kick against the doctrine of justification by the righteousness of the Saviour and set up their own self-righteousness in opposition to it. To be found in Christ, not having our own righteousness, which is of the law, but having the righteousness, which is of God by faith, is a very prominent badge of a real servant of God, and to refuse it is to manifest opposition to the glory of God, and to the name, person, and work of His exalted Son. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0976.cfm