Can one become a Buddha by thinking of becoming a Buddha?

The Śūraṅgama Sūtra: When the mind thinks of climbing to a high place and the soles of the feet feel sore and astringent, this shows that the material body is the first, most solid illusion. When the mind thinks of climbing to a high place, the manas believes it is truly standing on the peak of a high mountain, and fear arises in the mind, causing the soles of the feet to feel sore and astringent. By the same principle, the material body is also an illusion conjured up by the manas, produced by the most solid of all illusions.

Then, if the mind thinks of becoming a Buddha, can one actually become a Buddha? The key is that the manas has not cultivated to the point of truly wanting to become a Buddha; more precisely, the manas lacks sufficient faith in becoming a Buddha. If the faith were full and complete, one would certainly become a Buddha—it would only be a matter of time. Right now, our faith is increasing bit by bit, and as it does, we draw closer and closer to buddhahood. A person who truly wants to become a Buddha will practice with great diligence and vigor, disregarding everything else, renouncing all worldly things, and single-mindedly cultivating the Path—all of which will be evident in their every action.