Ashtangahridayasamhita 78

78

naikaḥ sukhī na sarva-tra viśrabdho na ca śaṅkitaḥ |
na kañ-cid ātmanaḥ śatruṃ nātmānaṃ kasya-cid ripum || 27 ||

One should not be happy alone, nor trusting everywhere, nor suspicious; / [one should declare] no one as one's enemy, nor oneself as the enemy of anyone; // 27