In plain words
Chakras and nadis, the lotus-deities that go with them, the sacred syllables, mandalas, forms of gods and the rest: never leave this direct path to think of any of these many things, not even a little, not for a moment.
Word for word
One should not leave this direct path to contemplate, even a little, chakras, subtle channels, associated lotus-deities, syllables, mandalas, forms and the other such supports.