Strong's 4337 (προσέχω)

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(give) attend(-ance, -ance at, -ance to, unto), beware, be given to, give (take) heed (to unto); have regard

(figuratively) to hold the mind (3563 implied) towards, i.e. pay attention to, be cautious about, apply oneself to, adhere to

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from G4314 (πρός) and G2192 (ἔχω);