何事にせよ成し遂げようと思うなら、人は常に自らの考えに多忙でなくてはならない。 - アントニ・ファン［アントニー・ヴァン］・レーウェンフック (1632 - 1723)
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A man has always to be busy with his thoughts if anything is to be accomplished. - Antonie [Anton/Antoni/Antony] van Leeuwenhoek (1632 - 1723)
![IMAGE: The usefulness of (the) useless. [Everyone knows the usefulness of useful things, but no one knows the usefulness of useless things. / Everyone knows the use of the useful, but not the use of the useless.] (Even if something did not bring immediate benefit, it could still turn out to be valuable.)](https://www.ok312.net/wp-content/uploads/2026/01/place-name-sign-822236_640-100x71.jpg)
![IMAGE: Adversities will make a jewel of you. / Adversity makes a man wise. [Adversity makes men wise.]](https://www.ok312.net/wp-content/uploads/2017/12/diamond-1186139_640-100x56.jpg)
