Ye are the salt of the earth: but if the salt have lost its savour, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men. -Matthew 5:13

There are legitimate reasons why the world, the church, and our Lord Jesus Christ Himself, may expect more from Christians than from the rest of mankind. And the first is, because they profess more. Professions should always be supported by facts, or else they are deceits, impostures, and hypocrisies. A Christian professes himself to be a renewed man; he has learned the evil of sin, repented of it, and fled from it to Christ Jesus; he professes to have been pardoned, and to have received a new heart and a right spirit; he professes, also, to be a child of God, and an heir of heaven. Other men do not profess this…Now, Christian, if you profess this, your life must prove it, or else, if your life gives the lie to your religious pretensions, you stand convicted of a flagrant falsehood, a fraud on men and a felony against God. It is a high crime and misdemeanor for a man to assume the name of a son of God, when he is utterly devoid of the divine nature, and lives in unholiness. In proportion as the privilege and the honor of a child of God is great, the sin of false pretensions to grace is increased. If you say you are regenerated, renewed, and sanctified, then be all that this means, or else cease your boasting…The world, in these times, will be sure to ask for proofs; the age for mere assertion is over. Men will say to you, you claim to have experienced this, and to be that; now, just act accordingly and we will believe you; and, if you do not give them a fair and honest reply, they will not mutter it in secret places, but they will make it plain to your face that they believe you to be a mere pretender; and, what is worse, they will blame the Christian religion of which you are so unworthy a professor…God save us from making a profession if we have not grace to live up to it.  ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1029.cfm