Avoid aimless thinking.
The importance of avoiding thinking during meditation can never be over-emphasised. Aimless and pointless thinking, especially when ill-will (vyapda), aversion (dosa), greed/desire (lobha), delusion (moha) and other such negative forces are involved, clouds the mind and makes it diffused. To gain a state of concentration and peace (samadhi) during meditation, all thinking must be ceased. Whatever skillful thinking/analysis that needs to be done, should be done at the end of the meditation.
Putting all aimless thinking aside even in daily life while going about work, study, travel, etc. goes a long way towards our happiness and peace of mind. This way the mind will be clear of all defiling thoughts and be light, happy and peaceful.
May you put all (aimless) thinking aside and be at peace. 
AIMLESS THINKING IS UNSKILLFUL
Aimless, pointless thinking,[1]
is unskillful,
while applied thinking to gain wisdom,
or to solve a problem,
is skillful,
so only think skillfully,
or not at all.
[1] See AN 1:16 – 321 Ekadhammapali, here http://www.mettanet.org/tipitaka/2Sutta-Pitaka/4Anguttara-Nikaya/Anguttara1/1-ekanipata/016-Ekadhammapali-e.html
321. [Lord Buddha:] Bhikkhus, just as a little bit of urine, … re … saliva, … re … pus,… re … blood smells and should be got rid of, I do not specify thinking* even for the fraction of a second.
* I do not specify thinking even for a short second. ‘appamattakampi bhavam na vannemi’ Always thoughts seek connections in the past, for the future or in the present. The bhikkhu who aims extinction should not advocte thinking, as thoughts prolong the journey in existence.
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2 Comments
I have found that if we restrict ourselves to being without thought completely we are only hindering our greatest ability. Of course I do agree with the concentration on silence, but I want to say that there is many things that come into the mind field that if pushed out they will/can only hinder our inner development.
I am also a practitioner of a few traditions different meditation styles and I am not ignorant to your views but in my experience I want to warn you of these types of suppression.
Dear friend,
Thank you for your kind feedback. However the key here is to avoid aimless thinking, which can often be useless, a waste of time and even destructive to oneself and others. The poem covers this: “while applied thinking to gain wisdom, or to solve a problem, is skillful…”, which refers to how thinking can be done skillfully and should be done when it is required for one’s and others’ benefit and well-being.
Also what was said was not to suppress thoughts. Thoughts will come and go from our mind all the time, whether we like this or not. But if they are useless, then let them go, don’t get caught up with them. If it is useful, and beneficial and leading one and others to happiness, then by all means pursue it, if this is practical to do. The only exception to this is during meditation, when thinking is not beneficial and takes one away from concentrating on the topic at hand.
This is what was meant and I hope that clears it up.