But as He which hath called you is holy, so be ye holy in all manner of conversation…- 1 Peter 1:15

O sirs, true holiness is a thing that will keep by night and by day, at home and abroad, on the land and on the sea! That man is not right with God who would not do the same in the dark that he would do in the light; who does not feel, “If every eye should look upon me, I would not be different from what I am when no eye gazes upon me; that which keeps me right is not the judgement and opinions of men, but the eye of the Omnipresent, and the heart of the Lord who loves me.” Is your obedience uniform? Some farmers I know, in the country, maintain a creditable profession in the village where they live; they go to a place of worship, and seem to be very good people: but there is a farmer’s dinner once a year, it is only once a year, and we will not say anything about how they get home,-the less that is said, the better for their reputation. “It is only once a year,” they tell us; but holiness does not allow of dissipation even “once a year.” And we know some who, when they go on the Continent, for instance, say, “Well, we need not be quite so exact there;” and therefore the Sabbath is utterly disregarded, and the sanctities of daily life are neglected, so reckless are they in their recreations. Well, sirs, if your religion is not warranted to keep in any climate, it is good for nothing.

You are a stranger to holiness if your heart does not feel that it revolts at the thought of sin. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2902.cfm