Many OSAS believers in Jesus do not want to sin all the time. I find comfort in the doctrine of eternal security. I trust in Jesus and his promise to not turn away those who come to him( John 6:37). It is His character and actions that prove that He can be trusted. I never see Jesus turn anyone away in the Gospels who desired something of him.
But, listen to God's will for us:
Deuteronomy 5:29 KJV "O that there were such an heart in them, that they would fear me, and keep all My commandments always, that it might be well with them, and with their children for ever!"wh
The fact is, if we're going to be a saint in heaven, we must first be a saint on Earth. While the blood of Jesus provides mercy for our mistakes as we "grow in grace", deliberate, known, habitual sin will not be found among God's true people on Earth any more than it is found among them in heaven.