Thomas Henry Huxley said this quote

Sit down before fact as a little child, be prepared to give up every preconceived notion, follow humbly wherever and to whatever abysses nature leads, or you shall learn nothing. I have only begun to learn content and peace of mind since I have resolved at all risks to do this.

~ Thomas Henry Huxley

The scientific spirit is of more value than its products, and irrationally held truths may be more harmful than reasoned errors.

~ Thomas Henry Huxley

What we call rational grounds for our beliefs are often extremely irrational attempts to justify our instincts.

~ Thomas Henry Huxley

From the dawn of exact knowledge to the present day, observation, experiment, and speculation have gone hand in hand; and, whenever science has halted or strayed from the right path, it has been, either because its votaries have been content with mere unverified or unverifiable speculation (and this is the commonest case, because observation and experiment are hard work, while speculation is amusing); or it has been, because the accumulation of details of observation has for a time excluded speculation.

~ Thomas Henry Huxley