'Secure' in the Bible

Having therefore these promises, beloved friends, let us purify ourselves from all defilement of body and of spirit, and secure perfect holiness through the fear of God.

Therefore, though I wrote to you, it was not to punish the offender, nor to secure justice for him who had suffered the wrong, but it was chiefly in order that your earnest feeling on our behalf might become manifest to yourselves in the sight of God.

Finally, brethren, be joyful, secure perfection of character, take courage, be of one mind, live in peace. And then God who gives love and peace will be with you.