1 Peter 3:15
but sanctify Christ as Lord in your hearts, always being ready to make a defense to everyone who asks you to give an account for the hope that is in you, yet with gentleness and reverence;

What I have written above is not against any particular creed of religious people, it is against any or all to whom it may justly apply, it may even be against some portions of my own; for even in this respect I am obliged daily to labor to sanctify the Lord God in my heart, to abstract him from every thing earthly and human, and apprehend him as far as possible in his own essential nature and attributes through the light of his Spirit and the medium of his own revelation. To act thus requires no common effort of soul: and just apprehensions of this kind are not acquired without much prayer, much self-reflection, much time, and much of the grace and mercy of God.