'Convinced' in the Bible

For I am convinced that neither death nor life, neither the lower ranks of evil angels nor the higher, neither things present nor things future, nor the forces of nature,

One man esteems one day more highly than another; another esteems all days alike. Let every one be thoroughly convinced in his own mind.

But as to you, brethren, I am convinced-- yes, I Paul am convinced--that, even apart from my teaching, you are already full of goodness of heart, and enriched with complete Christian knowledge, and are also competent to instruct one another.