“Reflection on wisdom manifest in G-d’s creation is the most accessible way of verifying His existence and the surest path of a true conception of Him.” - Rabbi Bachya Ibn Pakuda, Chovos HaLevavos, Sha’ar HaBechinah, Introduction.
He later said, “There are men who say that the world came into existence by chance, without a Creator Who caused it an formed it. I find this astonishing. How could any rational human being, in his right mind, entertain such a notion? If one who held such a view were to hear someone make a similar claim about a revolving water wheel – that it came about without the design of a craftsman who invested effort in putting it together, constructing it, and supplying all its parts so that it perform its intended function – he would be amazed by such a statement, speak slightly of the one who made it, consider him a total ignoramus, and be quick to expose him and reject his claim. Now if such a claim is rejected when it is made about a petty and insignificant little water wheel, which can be made with limited skill and serves a small plot of land, how can one allow himself to make the same claim about the celestial ‘wheel’ which encompasses the entire earth and all of its creatures; which reflects such an intelligence that its essence is beyond the grasp of all human understanding; which serves the well-being of the entire earth and everything in it? How can one say that it came into being without the intent of a Designer, without the planning of an omnipotent Intelligence?” - R. Bachya Ibn Pakuda, Chovos HaLevavos, Sha’ar HaYichud 6.
Note that William Paley’s “Watchmaker” argument was recorded, in its own Jewish way, 2,000 years ago in the Midrash Temurah, 5:
“A heretic came to Rabbi Akiva and asked, ‘Who created the universe?’ Rabbi Akiva answered, ‘The Holy One.’ There heretic said, ‘Prove it to me.’ Rabbi Akiva replied, ‘Come to me tomorrow.’ When the heretic came to him on the next day, Rabbi Akiva asked, ‘What is that you are wearing?’ ‘A garment,’ replied there heretic. ‘Who made it?’ asked Rabbi Akiva. The heretic replied, ‘A weaver.’ Rabbi Akiva said, ‘I don’t believe you! Prove it to me!’ ‘How can I prove it to you?’ replied the heretic, ‘How can you not know that a weaver made it?’ Rabbi Akiva said, ‘And how can you not know that the Holy One made the universe?’ After the heretic left, Rabbi Akiva’s students asked him, ‘But what is the proof?’ He said, ‘Just as a house attests to its builder, a garment to its weaver or a door to its carpenter, so too does the world attest to the Holy One who created it.’”