7 For as he thinketh in his heart, so is he: Prov 23:7 (KJV)
thinketh a primitive root; to split or open, i.e. (literal, but only as denominative from
(sha`ar)) to act as gate-keeper (see
(show`er)); (figurative) to estimate :- think.
—Strong's Talking Greek & Hebrew Dictionary
To think; to split or open. I imagine a picture of a seed being opened, releasing whatever is inside. The earth (our heart) is holding (meditating or pondering) the seed and as it germinates it splits open releasing the life within. It could be a magnificent flower or fast growing weed.
When we looked at the word meditate we found that the beginnings of the meditation could be positive or negative. We choose what thoughts we mull over, what seeds we crack open.
This definition also carries the thought of 'gate keeper'.
"Keep thy heart with all diligence; for out of it are the issues of life. "Prov 4:23 (KJV)
Take the time to consider what seeds are you planting. Your harvest depends upon the seed you sow.
