“To the pure, all things are pure, but to the defiled and unbelieving, nothing is pure; but both their minds and their consciences are defiled. They profess to know God, but they deny him by their works. They are detestable, disobedient, unfit for any good work” (Titus 1:15-16).
Paul is not promoting some kind of super criterion for salvation, but speaking of the heart which is wicked and deceitful until the Holy Spirit grabs hold and starts the work of sanctification. Yes, you can know them by their fruits (but the real and final judgement belongs to God). Pay attention to what you see and not necessarily what people say. Actions speak louder than words.
Lord, grant that I would have my eyes open to see what You would have me see. You know the hearts of others and I do not. You know where some mislead. Guide me Lord so that I would humbly see what You give me to see and go where You send me. Help me understand the seriousness of this life of faith You have given me in order that I may be genuine and faithful in this gift of grace.
Lord Jesus, You have come in order that I might have a new life. Help me to not live for myself, but to come to You who is the only One who can and will save me. Help me to be what I proclaim and to live according to Your goodness and mercy. Guide me this day so that what people see is who I truly am and let that be one who is following You with all that I am. Amen.