His deep sense of humility sprang from his perfect knowledge of himself. He considered self-knowledge an essential condition to the acquisition of true knowledge of any kind. "He knows nothing aright who knows not himself--who understands not the conditions of his own being. How dangerous it is for a religious soul to be eager to know indifferent things and yet neglect to learn its own deficiencies. That soul is near to ruin which is curious to know extraneous things and prone to judge others yet cares not to know itself." Apart from the sentiment of humility prompting this utterance, what profound wisdom does it not reveal! It establishes a truly golden rule for the guidance of the soul in its search after knowledge, secular or spiritual. It must begin by discovering its own limitations and defects. If it ignores these it cannot form a true estimate of anything. This truth was uttered by our Saint six hundred years ago and it is strange to hear it re-echoed in our own day under totally different circumstances. Men of science, on purely rational grounds, are reverting to the advice given by Bonaventure and are {69} deprecating the consequences of having hitherto more or less ignored it. Our knowledge of things distinct from ourselves must be modified and verified by our knowledge of the means by which it is acquired. The intensity of Bonaventure's humility is evidenced by the fact that whereas his biographers seem to have overlooked his other virtues, they have left on record several instances of his humility. The following incident related [Footnote 31] by Wadding is touching in its simplicity:-- [Footnote 31: "Annals," Tom. IV, Anno 1269. NO.5.]