Life is about growth.   As long as there is life something will grow.   
If we think about our lives as a lawn, there may be beautiful grass or ugly weeds.   

Our words and meditations of God are the release mechanisms of God`s Grace which enable the "grass" to grow and keep the "weeds" out.   

When our words and meditations are apart from God, Grace is blocked, the "grass" dies and the "weeds" spring up.   

Meditation on a specific idea or subject can be very beneficial.   It gives us clarity, depth and perspective.   

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things. Phi 4:8

So, we are exhorted to be judicious in what we meditate on - things that proceed from God.   

Transcendental Meditation involves clearing one`s mind and opening it to thoughts outside oneself.   

Would You open the front door of your house and wait to see who would walk in?   

This is what TM is about.   It gives Satan an opportunity to transmit his thoughts into a person`s mind.   

And no marvel; for Satan himself is transformed into an angel of light. 2Co 11:14

The thoughts that proceed from TM may seem beautiful but Satan only wants You to be wide of the mark.   

The Word of God should be the object of our meditation.   

But his delight is in the law of the Lord; and in his law doth he meditate day and night. Psm 1:2

But his delight is in the law of the Lord; and in his law doth he meditate day and night. Psm 1:2

Let the words of my mouth, and the meditation of my heart, be acceptable in thy sight, O Lord, my strength, and my redeemer. Psm 19:14

My mouth shall speak of wisdom; and the meditation of my heart shall be of understanding. Psm 49:3

My meditation of him shall be sweet: I will be glad in the Lord. Psm 104:34

When I remember thee upon my bed, and meditate on thee in the night watches. Psm 63:6

I will meditate also of all thy work, and talk of thy doings. Psm 77:12

Princes also did sit and speak against me: but thy servant did meditate in thy statutes. Psm 119:23

I have more understanding than all my teachers: for thy testimonies are my meditation. Psm 119:99

Mine eyes prevent the night watches, that I might meditate in thy word. Psm 119:148

I remember the days of old; I meditate on all thy works; I muse on the work of thy hands. Psm 143:5

Timothy 4:15

For thou, Lord, wilt bless the righteous; with favour wilt thou compass him as with a shield. Psm 5:12

Praise ye the Lord.     Blessed is the man that feareth the Lord, that delighteth greatly in his commandments. Psm 112:1

His seed shall be mighty upon earth: the generation of the upright shall be blessed. Psm 112:2

Wealth and riches shall be in his house: and his righteousness endureth for ever. Psm 112:3

Unto the upright there ariseth light in the darkness: he is gracious, and full of compassion, and righteous. Psm 112:4

Bless the Lord, O my soul: and all that is within me, bless his holy name. Psm 103:1

Bless the Lord, O my soul, and forget not all his benefits: Psm 103:2

Who forgiveth all thine iniquities; who healeth all thy diseases; Psm 103:3

Who redeemeth thy life from destruction; who crowneth thee with lovingkindness and tender mercies; Psm 103:4

Who satisfieth thy mouth with good things; so that thy youth is renewed like the eagle`s. Psm 103:5

O taste and see that the Lord is good: blessed is the man that trusteth in him. Psm 34:8

The young lions do lack, and suffer hunger: but they that seek the Lord shall not want any good thing. Psm 34:10

Trust in the Lord, and do good; so shalt thou dwell in the land, and verily thou shalt be fed. Psm 37:3

Delight thyself also in the Lord: and he shall give thee the desires of thine heart. Psm 37:4