There are in fact four very significant stumblingblocks in the way of grasping the truth, which hinder every … - Roger Bacon

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I think of her every time I judge myself or someone else too harshly. How do we really know the worth of our work? It's not our job to judge the worth of what we offer the world, but to keep offering it regardless. You might never know the true worth of your efforts. Or it could simply be too soon to tell.

Roger Bacon

There are in fact four very significant stumblingblocks in the way of grasping the truth, which hinder every man however learned, and scarcely allow anyone to win a clear title to wisdom, namely, the example of weak and unworthy authority, longstanding custom, the feeling of the ignorant crowd, and the hiding of our own ignorance while making a display of our apparent knowledge.

Apparent, Crowd, Ignorance, Men, Truth, Wisdom

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Vacuum stands and remains a mathematical space. A cube placed in a vacuum would not displace anything, as it would displace air or water in a space already containing those fluids.

Air, Cube, Remains, Space, Water

Argument is conclusive, but it does not remove doubt, so that the mind may rest in the sure knowledge of the truth, unless it finds it by the method of experiment.

Argument, Doe, Doubt, Knowledge, Mind

First, by the figurations of art there be made instruments of navigation without men to row them, as great ships to brooke the sea, only with one man to steer them, and they shall sail far more swiftly than if they were full of men; also chariots that shall move with unspeakable force without any living creature to stir them. Likewise an instrument may be made to fly withall if one sits in the midst of the instrument, and do turn an engine, by which the wings, being artificially composed, may beat the air after the manner of a flying bird.

Art, Artificially, Flying, Instruments, Men, Moving

But we must here state that we should not see anything if there were a vacuum. But this would not be due to some nature hindering species, and resisting it, but because of the lack of a nature suitable for the multiplication of species; for species is a natural thing, and therefore needs a natural medium; but in a vacuum nature does not exist.

Doe, Exist, Natural, Needs, Vacuum, Vacuums

But concerning vision alone is a separate science formed among philosophers, namely, optics, and not concerning any other sense. . . It is possible that some other science may be more useful, but no other science has so much sweetness and beauty of utility. Therefore it is the flower of the whole of philosophy and through it, and not without it, can the other sciences be known.

Flower, Formed, Philosophy, Vision