Arthashastra
शक्त्य् उदये यातव्यम् अनैकान्न्तिकत्वाद् व्यसनानाम् इति कौटिल्यः ॥
But Kautilya says: that when one's resources are sufficient one should march, since the troubles of an enemy cannot be properly recognised;
english translation
zakty udaye yAtavyam anaikAnntikatvAd vyasanAnAm iti kauTilyaH ॥
hk transliteration by Sanscript