user7648: While meditating, it is not always clear whether you mind is clear of thoughts or not. Some seems to be more emotions or visions. But if all emotions and visions are accompanied with thoughts which are the toughest to recognize that they are there in your mind?

user10100: The toughest to catch, in pāli, are the 5 uddhambhāgiya-saṃyojana of anāgāmi: rūparāga, arūparāga, māna, uddhacca, and avijjā (in English. the five "higher fetters" which are listed here).
However, by practice, general practitioners who have never enlightened before, should focus on 5 precepts and catch immoral physical actions, first. Then he should catch 5 kāmaguna-attachment (for jhāna meditation). Then he should catch diṭṭhi vicikicchā and silabataparāmāsa (for access to insight meditation).

user471: While BonnWarapol's five higher fetters would be the most difficult to eradicate for all non-arahants, for a beginner in meditation, the hardest to eradicate would be the five hindrances (pañca nīvaraṇāni):

Sensual desire (kāmacchanda)
Ill-will (vyāpāda)
Sloth and torpor (thīna-middha)
Restlessness and remorse (uddhacca-kukkucca)
Sceptical doubt (vicikicchā)

The commentaries by Ven. Nyanaponika Thera here or by Ven. Ajahn Brahm here, would provide more information on these. This video by Ven. Yuttadhammo Bhikkhu would also be helpful.

7648: <p>While meditating, it is not always clear whether you mind is clear of thoughts or not. Some seems to be more emotions or visions. But if all emotions and visions are accompanied with thoughts which are the toughest to recognize that they are there in your mind?</p>
 10100: <p>The toughest to catch, in pāli, are the <a href="http://84000.org/tipitaka/dic/d_seek.php?text=%CA%D1%A7%E2%C2%AA%B9%EC&amp;original=1" rel="nofollow noreferrer">5 uddhambhāgiya-saṃyojana</a> of anāgāmi: rūparāga, arūparāga, māna, uddhacca, and avijjā (in English. the five "higher fetters" which <a href="https://en.wikipedia.org/wiki/Fetter_(Buddhism)#Lists_of_fetters" rel="nofollow noreferrer">are listed here</a>).</p>

<p>However, by practice, <strong>general practitioners</strong> who have never enlightened before, should focus on 5 precepts and <strong>catch immoral physical actions, first</strong>. Then he should catch <strong>5 kāmaguna-attachment</strong> (for jhāna meditation). Then he should catch <strong>diṭṭhi vicikicchā and silabataparāmāsa</strong> (for access to insight meditation).</p>
 471: <p>While BonnWarapol's <a href="https://en.wikipedia.org/wiki/Fetter_(Buddhism)#Lists_of_fetters" rel="nofollow noreferrer">five higher fetters</a> would be the most difficult to eradicate for all non-arahants, for a beginner in meditation, the hardest to eradicate would be <a href="https://en.wikipedia.org/wiki/Five_hindrances" rel="nofollow noreferrer">the five hindrances (pañca nīvaraṇāni)</a>:</p>

<ul>
<li>Sensual desire (kāmacchanda)</li>
<li>Ill-will (vyāpāda)</li>
<li>Sloth and torpor (thīna-middha)</li>
<li>Restlessness and remorse (uddhacca-kukkucca)</li>
<li>Sceptical doubt (vicikicchā)</li>
</ul>

<p>The commentaries by Ven. Nyanaponika Thera <a href="http://www.accesstoinsight.org/lib/authors/nyanaponika/wheel026.html" rel="nofollow noreferrer">here</a> or by Ven. Ajahn Brahm <a href="http://www.budsas.org/ebud/ebmed051.htm" rel="nofollow noreferrer">here</a>, would provide more information on these. <a href="https://youtu.be/045CIKp9ttA" rel="nofollow noreferrer">This video</a> by Ven. Yuttadhammo Bhikkhu would also be helpful.</p>
