Romans 12:1 I beseech you therefore, brethren, by the mercies of God, that ye present your bodies a living sacrifice, holy, acceptable unto God, which is your reasonable service.
2 And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God.
3 For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith.
4 For as we have many members in one body, and all members have not the same office:
5 So we, being many, are one body in Christ, and every one members one of another.
6 Having then gifts differing according to the grace that is given to us, whether prophecy, let us prophesy according to the proportion of faith;
7 Or ministry, let us wait on our ministering: or he that teacheth, on teaching;
Here is a post on the topic of the renewing of the mind.
Thoughts lead to words and words are very important. At the bottom of each blog post there is a link that takes you to a page with resources. Some of those links will connect you to teachings on the importance of words.
Numbers 14:28 (KJV) Say unto them, As truly as I live, saith the LORD, as ye have spoken in mine ears, so will I do to you:
Proverbs 18:21 Death and life are in the power of the tongue: and they that love it shall eat the fruit thereof.
Matthew 12:37 For by thy words thou shalt be justified, and by thy words thou shalt be condemned
A blog post can only introduce a topic, but not cover it in depth. For more study on various topics, click here for links to Christian bookstores and other Christian sites.
The link above will take you to links to sites that teach on faith, prayer, confession, healing and more. They have church services, podcasts, bookstores, and further resources and teaching.