'Ought' in the Bible

We ought to give thanks to God always for you, brethren, as it is meet, because increase greatly doth your faith, and abound doth the love of each one of you all, to one another;

And we -- we ought to give thanks to God always for you, brethren, beloved by the Lord, that God did choose you from the beginning to salvation, in sanctification of the Spirit, and belief of the truth,

For yourselves know how ye ought to follow us: for we behaved not ourselves disorderly among you;